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How to change PCM on HHR - 2008 Chevrolet Hhr

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If you don't know how to change it, you probably don't know that it has to be flashed before installed.

Posted on Apr 19, 2014

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Posted on Jan 02, 2017

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I have 2007 hhr and the code is p0171


This code is triggered by the first downstream (front) O2 sensor. The sensor provides a reading of the air:fuel ratio leaving the engine's cylinders, and the vehicles powertrain/engine control module (PCM/ECM) uses that reading and adjusts to keep the engine running at that optimum ratio of 14.7:1. If something is not right and the PCM cannot maintain the 14.7:1 ratio, but rather there is too much air, it triggers this code.

Read more at: http://www.obd-codes.com/p0171
Copyright © OBD-Codes.com

Feb 25, 2015 | 2007 Chevrolet Chevrolet HHR LT

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2006 HHR with check engine light flashing. Codes


code 300 means multiple misfire due to plugs, wires, fuel problem including injectors.. A P0106 could be caused by:
  • Bad MAP sensor
  • Water/dirt intrusion affecting MAP sensor connector
  • Intermittent open in the reference, ground, or signal wire for the MAP sensor
  • Intermittent short in the reference, ground, or signal wire for the MAP sensor
  • Ground problem due to corrosion causing intermittent signal problem
  • A break in the flexible air intake duct between the MAF and the intake manifold
  • Bad PCM (do not assume the PCM is bad until you've exhausted all other possibilities)
Using a scan tool, watch the MAP sensor value with the key on, engine off. Compare the BARO reading with the MAP reading. They should be roughly equal. The voltage for the MAP sensor should read approx. 4.5 volts. Now start the engine and look for a significant drop in the MAP sensor voltage indicating the MAP sensor is working. If the MAP reading doesn't change perform the following:
  1. With the Key on, engine off, disconnect the vacuum hose from the MAP sensor. Using a vacuum pump, pull 20 in. of vacuum on the MAP sensor. Does the voltage drop? It should. If it doesn't inspect the MAP sensor vacuum port and vacuum hose to manifold for a restriction of some kind. Repair or replace as necessary.
  2. If there are no restrictions, and the value doesn't change with vacuum, then perform the following: with the Key on and engine off and the MAP sensor unplugged, check for 5 Volts at the reference wire to the MAP sensor connector with a Digital Voltmeter. If there is none, check for reference voltage at the PCM connector. If the reference voltage is present at the PCM connector but not the MAP connector, check for open or short in the reference wire between MAP and PCM and retest.
  3. If reference voltage is present, then check for existing ground at the MAP sensor connector. If it isn't present then repair open/short in the ground circuit.
  4. If ground is present, then replace MAP sensor.

Oct 10, 2014 | 2006 Chevrolet HHR

1 Answer

What would cause power steering light to come on and locks cycle and trans downshift at same time on a 2006 hhr


i'd get the OBD codes read ASAP as you cant take chances with steering etc, could well be the ECU or PCM

Sep 25, 2014 | 2006 Chevrolet HHR LT

2 Answers

My 2009 HHR wont into drive but reverse is fine


Check transmission fluid condition and has the mileage reached for the recommended change. If the tranny is computer controlled, get it scanned for error codes.

Jun 11, 2014 | 2009 Chevrolet HHR

2 Answers

Fuse box for a 2007 hhr


how to change fuse box on 2007 hhr under the hood?

Mar 12, 2013 | 2006 Chevrolet HHR

1 Answer

How do I change the front brake discs and brake pads on a 2006 Chevy HHR LS model 2.2L 4 Cyl.?


Changing the pads is very straight forward and is no different from any other disc brake equipped vehicle. However, if you have never changed disc brakes before I would NOT recommend you do so on you HHR without either a shop or technical manual. Changing the rotors is very easy - they slide off the mounting studs once the disc calipers are removed.

May 11, 2010 | 2006 Chevrolet HHR

1 Answer

Chevrolet HHR fusils


The interior fuse box is on the passenger side of the center console. There is a panel that just pulls off. There is also a panel nder the hood for engine, PCM and relays. Also, you may want to check the under hood fuses and relays, it has been reported that these come unseated, causing many electrical problems.

Dec 23, 2008 | 2006 Chevrolet HHR

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