C0021

Brake Booster Performance (Subfault)

DTC C0021, sometimes indicated as C002100 is an OBD diagnostic trouble code indicating a generic fault with the vehicle chassis.

  • C0021: Brake Booster Performance (Subfault)

See Also: Related Error Codes
DTC Trouble Code Search
Bulletins

Bulletins are notices put out by manufacturers in conjunction with the NHTSA to notify the public of manufacturing issues or changes.

  • PIT5728D - ELECTRICAL SYSTEM
    CHEVROLET: This preliminary information communicates an issue with dtc P0606 and C0021 setting after completing campaign n192268090and advises to reprogram thebscm with updated calibrationsavailable in tis2web.
  • PIT5728C - ELECTRICAL SYSTEM
    CHEVROLET: This preliminary information communicates an issue with dtc P0606 and C0021 setting after completing campaign n192268090 and advises to reprogram the bscm with updated calibrations available in tis2web.
  • PIT5728B - ELECTRICAL SYSTEM
    CHEVROLET: This preliminary information communicates an issue with dtc P0606 and C0021 setting after completing campaign n192268090and advises to reprogram thebscm with updated calibrationsavailable in tis2web.
  • PIT5728A - ENGINE AND ENGINE COOLING
    CHEVROLET: This preliminary information communicates an issue with dtc P0606 and C0021 setting after completing campaign n192268090and it provides information about using and maintaining proper battery voltage while programming the bscm.
  • PIT5728 - ELECTRICAL SYSTEM
    CHEVROLET: This preliminary information communicates an issue with dtc P0606 and C0021 setting after completing campaign n192268090and it provides information about using and maintaining proper battery voltage while programming the bscm.
Consumer Complaints for this DTC



2019 CHEVROLET SILVERADO 1500 with 423.0 miles

Tl* the contact owns a 2019 Chevrolet Silverado 1500. While driving 60 mph, the check engine, stability control, traction control, and abs warning indicators illuminated. Also, the "limited to 62 mph" message was displayed and the vehicle did not respond when the brakes were applied. The contact had to downshift for the vehicle to stop. The contact called onstar and was informed that codes: 925a2, P0606, and C0021 regarding the ecm, charging system, air bags, and transmission were detected. The vehicle was taken to gilbert Chevrolet (3550 us-441, okeechobee, fl 34974, (863) 261-8947), but was not diagnosed or repaired. The failure mileage was 423.
SERVICE BRAKES,



2019 CHEVROLET SILVERADO 1500 with 1500 miles

Purchased new vehicle with less than 4,000 miles was running fine when parked. When it was cranked to go home listed esc failure, service steering column lock, trailering system failure, lane departure disabled, speed limited to 60 mph. I was able to get home, but the brakes were so hard that it was extremely difficult to stop. Local dealer it was purchased through "fixed it" less than 1,500 miles later i'm having the same issue! Obd has the codes C0021, C0021, P25A2, P25A2, P0606. I do not feel safe driving this truck! If that issue were to happen approaching an intersection i would have no way of stopping in time. Ridiculous.
ELECTRICAL SYSTEM, ELECTRONIC STABILITY CONTROL SERVICE BRAKES



2019 CHEVROLET SILVERADO 1500 with 26210 miles

Reduced ability to brake my truck almost caused accident.. Warning light popped up abs, brake,traction control with warnings going across dash like brake system failure 62 mph top speed, service trailer brakes. Codes C0021 P0606,& P25A2. Had update for this problem a couple weeks ago and it was suppose to fix this the dealership said over the phone when called today. Never had this problem before .I am pretty sure that update just updates the messaging letting the driver know he or she is about to die. Taking it into dealer later today. Zf trw integrated brake control (ibc) had early manufacturing issue leaving metal shaving in the units. These shaving would score the walls and damage units,no ones investigating this issue because it would cost gm too much to replace all ibcs in every truck during early stages of the t1 launch. Trw knows of this issue and has piles of these sitting on engineers desks. There needs to be a recall on all early production t1 truck to replace these ibcs. Gm has only been replacing these on a case by case bases when someone reports this problem and their vin number falls within trw suspected problem dates. By this time its too late and can cause an accidents.
ELECTRONIC STABILITY CONTROL, SERVICE BRAKES



2019 CHEVROLET SILVERADO 1500 with 13000 miles

After remote start mychev app vehicle stationary four dash messages service esc service trailer brake brake system failure - 62 mph top speed steering assist reduced drive with care  lights on dash that were illuminated abs check engine brake traction control tried to drive. Brakes and steering limited could not drive unsafe turned off ignition restarted threw five codes including P0606 C0021 P25A2 called onstar, they said all systems showing failed take to dealer called gm- they said to have it towed remote start again- same messages dealer appt tomorrow.
STEERING, ELECTRONIC STABILITY CONTROL SERVICE BRAKES ENGINE ELECTRONIC STABILITY CONTROL ELECTRONIC STABILITY CONTROL SERVICE BRAKES ELECTRONIC STABILITY CONTROL ELECTRICAL SYSTEM SERVICE BRAKES ELECTRONIC STABILITY CONTROL STEERING SERVICE BRAKES



2010 DODGE CARAVAN with 9800.0 miles

September 7, 2015, was entering interstate, car continued to accelerate with accelerator depressed, pressing on brake was minimally functional, managed to get car on offramp and to parking lot, however brakes were extremely hot and brake light was on. Turned off the ignition, and restarted car. Accelerator was still depressed so turned car off. Came back after two hours and car functioned normally. Took car to Dodge service repair, showed a code P2299, brake pedal position-accelerator position, and code C0021 brake booster performance. Mechanic cleared codes, stated that handicapped hand controls were engineered improperly and allowed both brakes and accelerator to be used at same time. Service manager stated they had never heard of a wireless throttle body control problem and that i was the first to complain. Later stated that several other hand control units they had worked on functioned improperly. It was extremely evident they were covering a stuck throttle body problem that has been seen by a number of non-Dodge authorized mechanics.
FUEL/PROPULSION SYSTEM, ELECTRICAL SYSTEM ENGINE

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