Engine Controls - MIL ON/DTC's P0451/P0454 Set
TECHNICALBulletin No.: 10-06-04-001C
Date: December 08, 2010
Subject: Intermittent MIL/Check Engine Light On, DTC P0451 or P0454 (Install Fuel Tank Pressure Sensor Cover)
Models:
2009-2010 Chevrolet Cobalt, Colorado (Built Prior to January 13, 2010), Silverado (Built Prior to November 4, 2009)
2009-2010 GMC Canyon (Built Prior to January 13, 2010), Sierra (Built Prior to November 4, 2009)
2009-2010 Pontiac G5
Supercede:
This bulletin is being revised to update the Warranty Information. Please discard Corporate Bulletin Number 10-06-04-001B (06 - Engine/Propulsion System).
Condition
Some customers may comment on a check engine light. Upon further investigation, a technician may find one of the above DTCs.
Cause
This condition may be caused by normal water accumulation or condensation blocking the air reference port of the fuel tank pressure sensor. Blockage can cause inaccurate output signals. If the signal varies during an Engine Off Natural Vacuum test, a false DTC could set.
Correction
Review the diagnostic information contained in SI for the DTC and repair as necessary. If SI diagnosis does not isolate the cause of this concern, ONLY install a fuel pressure sensor shield, P/N 20893611. Clear the DTCs.
Chevrolet Colorado, Silverado and GMC Canyon, Sierra
1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
2. Place a suitable adjustable jack under the fuel tank.
3. Remove the fuel tank strap bolts.
4. Remove the fuel tank straps.
5. Lower the fuel tank halfway.
6. Locate the fuel tank pressure sensor (1).
7. Install the fuel tank pressure sensor cover, GM P/N 20893611.
Chevrolet Cobalt and Pontiac G5
1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
2. Install the fuel tank pressure sensor cover (1), GM P/N 20893611.
Parts Information
Warranty Information
For vehicles repaired under warranty, use the table.
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