PIP4870D
Service Bulletin Details
Public Details for: PIP4870D
This preliminary information communication provides information to the technician about vehicles that may have a engine noise is sometimes louder than expected. Also will explain the known normal and abnormal reasons why the engine may be l
- 2016 - 2015 - 2014 - 2013 - 2012 - 2011 -
Models from 2016
| 2016 CADILLAC ELR |
Models from 2015
| 2015 CADILLAC ELR |
| 2015 CHEVROLET VOLT |
Models from 2014
| 2014 CADILLAC ELR |
| 2014 CHEVROLET VOLT |
| 2014 OPEL AMPERA |
Models from 2013
| 2013 CHEVROLET VOLT |
| 2013 OPEL AMPERA |
Models from 2012
| 2012 CHEVROLET VOLT |
| 2012 OPEL AMPERA |
Models from 2011
| 2011 CHEVROLET VOLT |
Bulletin No.: PIP4870D Published date: 04/5/2019 Preliminary Information PIP4870D (EREV) Engine Or Exhaust Noise While Driving In Extended Range Mode Models Brand: Model: Model Years: VIN: from Engine: to Transmissions: Chevrolet Volt 2011 - 2015 All All All All Cadillac ELR 2014 - 2016 All All All All Opel Ampera 2012 - 2014 All All All All Supersession Statement This PI was superseded to update Model Years. Please discard PIP4870C. The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition / Concern Some customers may comment that the engine noise is sometimes louder than expected. This document will explain known normal and abnormal reasons why the engine may be louder in some conditions and vehicles during Extended Range driving. Recommendations / Instructions Normal Conditions: 1) The engine noise can be more perceivable between 25 – 50 MPH (40 – 80 KPH). This is a sensitive range where the road noise does not mask the engine, and it is the typical transition zone during electric launch to engineauto-start. 2) During the first engine start and warm-up of the da y, the system will perform a catalyst preconditioning for about a minute. This can be a time period where the engine seems louder than normal. 3) For fuel economy, the engine often runs at wide open throttle, but at a reduced speed. This sound is uncharacteristicof a four-cylinder engine in a traditional sedan, but is a characteristic of an extended range electric vehicle such as theChevrolet Volt. Abnormal Induction Ground-Out Conditions: 1) Lower rubber isolator on air box not installed correctly or missing 2) Upper induction resonator cover not installed properly 3) Refrigerant line not bolted to engine support brack et 4) Throttle body contacting coolant pipes behind it Abnormal Exhaust Ground-Out Conditions: 1) Exhaust clamp rearward of the second catalytic converter is contacting the Battery (RES S) heat shield 2) Exhaust Resonator underbody is contactingthe heat shield Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. © 2019 General Motors. All Rights Reserved.