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Service bulletin PI-0470

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 id10038707
Published by NHTSA2011-06-27
Manufacturer's numberPI-0470
Manufacturer's date2011-05-01
NHTSA componentENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE; ENGINE AND ENGINE COOLING:ENGINE

NHTSA's summary

GM: THERE IS A SLIGHT OIL SEEP FROM THE CENTER OIL GALLEY PLUG ON THE BACK OF THE ENGINE BY THE EXHAUST MANIFOLD. 2011 HHR/MALIBU. *RM

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Engine, Exhaust and emissions, Exhaust manifold, pipes and muffler

Vehicles listed
CHEVROLET HHR2011
CHEVROLET MALIBU2011

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

Other bulletins for the same vehicles and component
PIP4112S2018-05-21. Service bulletin. This Preliminary Information communication provides information to the technician of a complaint of a sag or hesitation when accelerating. The concern is present when coasting at low speeds of less than 15 miles per hour and then aggressively applying the throttle, or after making a hard stop followed by an aggressive throttle. This concern may also be present while crusing at highway speeds and then an aggressive increase in throttle.This is considered normal operation of the vehicle the throttle is delayed and opened slowly up to .7 seconds to help minimize driveline lash and clunking or will have approximately .5 seconds of zero torque to allow the transmission to shift to downshift.
PIP-48582011-05-25. Service bulletin. GM: THE MALFUNCTION LIGHT IS ON AND THERE IS LOW POWER DUE TO A CRACKED EXHAUST MANIFOLD. *RM