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Service bulletin PIP4870C

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10114383
Published by NHTSA2017-08-15
Manufacturer's numberPIP4870C
Manufacturer's date2015-02-04
NHTSA componentENGINE AND ENGINE COOLING

NHTSA's summary

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 louder. When the vehicle speed is between 25-50 miles per hour the road noise does not mask the engine noise this is considered normal. When the vehicle is first started for the day the system will perform a catalyst preconditioning for about a minute. At this time the engine will seem louder than normal, this is normal. At times the engine often runs at wide open throttle, but at a reduced speed. This sound is uncharacteristic of a four-cylinder engine in a traditional sedan, but is a characteristic of an extended range electric vehicle such as the Chevrolet Volt. Technician will be able to inspect for abnormal induction ground-out conditions. These locations should be checked lower rubber isolator on air box not installed correctly or missing, upper induction resonator cover not installed properly, refrigerant line not bolted to engine support bracket, and throttle body contacting coolant pipes behind it. Abnormal exhaust ground-out conditions should also be inspected. These locations are at the exhaust clamp rearward of the second catalytic converter is contacting the battery heat shield, exhaust resonator underbody is contacting the heat shield. Repair any abnormal issue found.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine

Vehicles listed
CADILLAC ELR2014, 2015
CHEVROLET VOLT2011, 2012, 2013, 2014, 2015

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
15V1450002015-03-13. ELECTRICAL SYSTEM:IGNITION; ENGINE AND ENGINE COOLING:ENGINE:GASOLINE
20151042015-03-12. Engine

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
25-NA-0522025-04-28. Service bulletin. This bulletin advises the technician to flush the cooling system multiple times if oil has been found in the cooling system and replace the parts that may be contaminated due to oil in system.
21-NA-0432025-02-12. Service bulletin. This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
21-NA-0432024-12-10. Service bulletin. This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
23-NA-0442024-09-11. Service bulletin. This service bulletin provides information on AGM batteries that require less frequent charging in storage.
01-06-01-011P2024-09-05. Service bulletin. This service bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
12-01-37-001G2024-08-13. Service bulletin. This service bulletin provides information to dealership personnel on a new refrigerant (R1234yf) for A/C service.
18-NA-1252024-06-28. Service bulletin. This service bulletin provides information for engine oil life monitor operation calculation.
18-NA-1252024-06-08. Service bulletin. This service bulletin provides information for engine oil life monitor operation calculation.
15-00-89-004G2024-05-15. Service bulletin. This service bulletin provides technicians with information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
PI0412B2024-05-06. Service bulletin. No Crank/No Start, Dead Battery Due to Parasitic Drain/Discharge.