P1603
Throttle Control Unit Detected Loss of Return Spring
DTC P1603, sometimes indicated as P160300 is an OBD diagnostic trouble code indicating a manufacturer-specific fault with the vehicle powertrain (i.e. engine and gearbox). This code identifies an error with the causing throttle control unit detected loss of return spring.
- P1603: Throttle Control Unit Detected Loss of Return Spring
- P1603 00: Engine control module (ECM) - malfunction
See Also: Related Error Codes
Bulletins are notices put out by manufacturers in conjunction with the NHTSA to notify the public of manufacturing issues or changes.
- T-TT-0462-17 - FUEL SYSTEM, OTHER:STORAGE:TANK ASSEMBLY:PRESSURE RELIEF DEVICES
TOYOTA: T-tt: vehicles may experience various drivability concerns. Upon diagnosis, technicians commonly find no or low fuel pressure as well as a variety of dtcs (commonly P1603, P1604, P1605, P0171, P0300, P0302, P0304, U0100). Technicians find t - S-SB-0008-16 - ENGINE AND ENGINE COOLING
SCION: Tsb: some 2012 ? 2013 model year iq vehicles may exhibit one or more of the following conditions: * rough idle condition. * idle speed momentarily drops at idle. * mil ?On? With one or more of the following dtcs: P1603, P1604 and/or p16 - 0502 - ELECTRICAL SYSTEM
VOLKSWAGEN: Diagnostic trouble code (dtc) P1603 (18011) stored in dtc memory. *tt
2018 TOYOTA RAV4 with 8940.0 miles
My 2018 Toyota Rav4 has stalled 5 times while driving on city streets in moving traffic, first time in feb 2019 while driving home from work, in april three times while driving to work and one time while driving home from work(rush hour). All documented with Toyota. Occurs when i take my foot off the gas while driving, and difficulty restarting after it stalls with loss of power and sputtering. 'charging system malfunction' warning msg appeared on dashboard(i took photo and emailed to Toyota). I followed instructions in 2018 Toyotal Rav4 owner's manual "stop the car immediately...Continuing to drive the vehicle may be dangerous". Had car towed to Toyota immediately. 3 trouble codes were recorded P1603(engine stall), P1604 startability malfunction, and P1605(rough idling), however they were unable to determine root cause of stalling and refused to keep my car to do further analysis despite the fact that i told them i did not feel safe driving vehicle, and my car is still under comprehensive warranty coverage. I contacted corporate, and they restated dealer conclusions and would not allow me to speak to a field tech specialist. I then emailed and wrote a letter to vp sales of Toyota, andrew gilleland. Rep from executive office called me. I asked for Toyota to provide me with either transportation assistance and a no cost-to-me extended comprehensive warranty until the underlying cause is determined and without further stalling incidences, or a replacement vehicle. He refused, despite all the significant potentially dangerous safety issues in a vehicle with less than 9,200 miles. Toyota does not appear to be concerned with reliability, peace of mind, and most of all safety. I have a case # with Toyota. I recently discovered there are several other reports on this site with same stalling issues as my car.
POWER TRAIN, ELECTRICAL SYSTEM
2018 TOYOTA RAV4 with 8940.0 miles
My 2018 Toyota Rav4 has stalled 5 times while driving on city streets in moving traffic, first time in feb 2019 while driving home from work, in april three times while driving to work and one time while driving home from work(rush hour). All documented with Toyota. Occurs when i take my foot off the gas while driving, and difficulty restarting after it stalls with loss of power and sputtering. 'charging system malfunction' warning msg appeared on dashboard(i took photo and emailed to Toyota). I followed instructions in 2018 Toyotal Rav4 owner's manual "stop the car immediately...Continuing to drive the vehicle may be dangerous". Had car towed to Toyota immediately. 3 trouble codes were recorded P1603(engine stall), P1604 startability malfunction, and P1605(rough idling), however they were unable to determine root cause of stalling and refused to keep my car to do further analysis despite the fact that i told them i did not feel safe driving vehicle, and my car is still under comprehensive warranty coverage. I contacted corporate, and they restated dealer conclusions and would not allow me to speak to a field tech specialist. I then emailed and wrote a letter to vp sales of Toyota, andrew gilleland. Rep from executive office called me. I asked for Toyota to provide me with either transportation assistance and a no cost-to-me extended comprehensive warranty until the underlying cause is determined and without further stalling incidences, or a replacement vehicle. He refused, despite all the significant potentially dangerous safety issues in a vehicle with less than 9,200 miles. Toyota does not appear to be concerned with reliability, peace of mind, and most of all safety. I have a case # with Toyota. I recently discovered there are several other reports on this site with same stalling issues as my car.
POWER TRAIN, ELECTRICAL SYSTEM
2018 TOYOTA RAV4 with 8940.0 miles
My 2018 Toyota Rav4 has stalled 5 times while driving on city streets in moving traffic, first time in feb 2019 while driving home from work, in april three times while driving to work and one time while driving home from work(rush hour). All documented with Toyota. Occurs when i take my foot off the gas while driving, and difficulty restarting after it stalls with loss of power and sputtering. 'charging system malfunction' warning msg appeared on dashboard(i took photo and emailed to Toyota). I followed instructions in 2018 Toyotal Rav4 owner's manual "stop the car immediately...Continuing to drive the vehicle may be dangerous". Had car towed to Toyota immediately. 3 trouble codes were recorded P1603(engine stall), P1604 startability malfunction, and P1605(rough idling), however they were unable to determine root cause of stalling and refused to keep my car to do further analysis despite the fact that i told them i did not feel safe driving vehicle, and my car is still under comprehensive warranty coverage. I contacted corporate, and they restated dealer conclusions and would not allow me to speak to a field tech specialist. I then emailed and wrote a letter to vp sales of Toyota, andrew gilleland. Rep from executive office called me. I asked for Toyota to provide me with either transportation assistance and a no cost-to-me extended comprehensive warranty until the underlying cause is determined and without further stalling incidences, or a replacement vehicle. He refused, despite all the significant potentially dangerous safety issues in a vehicle with less than 9,200 miles. Toyota does not appear to be concerned with reliability, peace of mind, and most of all safety. I have a case # with Toyota. I recently discovered there are several other reports on this site with same stalling issues as my car.
POWER TRAIN, ELECTRICAL SYSTEM
2018 TOYOTA RAV4 with 8940.0 miles
My 2018 Toyota Rav4 has stalled 5 times while driving on city streets in moving traffic, first time in feb 2019 while driving home from work, in april three times while driving to work and one time while driving home from work(rush hour). All documented with Toyota. Occurs when i take my foot off the gas while driving, and difficulty restarting after it stalls with loss of power and sputtering. 'charging system malfunction' warning msg appeared on dashboard(i took photo and emailed to Toyota). I followed instructions in 2018 Toyotal Rav4 owner's manual "stop the car immediately...Continuing to drive the vehicle may be dangerous". Had car towed to Toyota immediately. 3 trouble codes were recorded P1603(engine stall), P1604 startability malfunction, and P1605(rough idling), however they were unable to determine root cause of stalling and refused to keep my car to do further analysis despite the fact that i told them i did not feel safe driving vehicle, and my car is still under comprehensive warranty coverage. I contacted corporate, and they restated dealer conclusions and would not allow me to speak to a field tech specialist. I then emailed and wrote a letter to vp sales of Toyota, andrew gilleland. Rep from executive office called me. I asked for Toyota to provide me with either transportation assistance and a no cost-to-me extended comprehensive warranty until the underlying cause is determined and without further stalling incidences, or a replacement vehicle. He refused, despite all the significant potentially dangerous safety issues in a vehicle with less than 9,200 miles. Toyota does not appear to be concerned with reliability, peace of mind, and most of all safety. I have a case # with Toyota. I recently discovered there are several other reports on this site with same stalling issues as my car.
POWER TRAIN, ELECTRICAL SYSTEM
2017 SUBARU LEGACY with 800.0 miles
Tl* the contact owns a 2017 Subaru Legacy. While depressing the brake pedal and coming to a complete stop, the engine shut off without warning. The contact was able to restart the vehicle and it operated normally; however, the failure later occurred several times. The dealer performed diagnostic and fuel testing, which produced a code of P1603 and a good fuel reading; however, the contact was advised to use a different fuel station. The manufacturer was made aware of the failure. The failure mileage was approximately 800.
ENGINE, FUEL/PROPULSION SYSTEM
2017 TOYOTA COROLLA with 13192.0 miles
Car stalled while driving. Gave dtc P0113, P0013, P1603, P1605.
ENGINE,
2013 TOYOTA SIENNA with 4.0 miles
Sliding (l&r) doors opened prematuely few times and now auto function stopped working. System displays P1603 code and says maintenance required, but there is no problem found.
STRUCTURE:BODY, ELECTRONIC STABILITY CONTROL
2006 JEEP GRAND CHEROKEE with 60000.0 miles
The pcm is not communicating between the computer and the transmission. It's making the transmission jump, loose power while driving, warning saying transmission over temp (can come on even when you just start driving), code P1603-pcm internal dual port ram, communication failure. The rpm's have ramped up and down while at a stop, loose power while driving, and can even turn off while driving. Eventually the alternator went bad. Replaced alternator and battery have been replaced 8/16/20. Eventually if the ecm is not replaced then it'll kill the vehicle. The transmission over temp started around 60,000 miles. This issue has steadily gotten worse overtime, became more frequent, and more dangerous. I've read of lots of people have the same issue and there's been no recalls. I feel there should be a recall for safety issues. Please look into the number of people having the same issue.
POWER TRAIN, POWER TRAIN