If they reappear, look for a communication issue from the BCM U2107 or ECM U2105 (wiring, connector, etc.) as the root cause. If the codes are in history, clear the codes and re-key the vehicle a few times to see if they come back. Power Steering Warning Message on DIC with DTC U2105 and/or U2107 in the PSCM with any other U codesĪlthough the code(s) appear in the PSCM, these are communication codes and are not the result of a problem with the column operation or the control module. Note: If the DTC resets immediately following motor replacement, replace the steering column. If the connection is normal, replace ONLY the EPS motor. Power Steering Warning Message on DIC with DTC C0475 in the PSCMĬheck the connection between the EPS motor and the power steering control module (PSCM) by ensuring the harness connector is properly seated. If no connector problems are found, replace the steering column ONLY as this is an internal controller issue. Inspect the motor harness connection to the PSCM. Power Steering Warning Message on DIC with DTC C0550 in the PSCM Refer to Corporate Bulletin Number 06-02-32-002C for additional information. DO NOT replace the steering column for this condition. This is a normal operating characteristic of the system. This condition is often the result of excessive lock-to-lock turns of the steering wheel, causing the thermal protection in the power steering control module (PSCM) to take the steering motor temporarily off line. Power Steering Warning Message on DIC with DTCs C0176 and C0476 DO NOT replace the steering column unless an internal short has been identified in the column that is causing fuse to blow. Check for this particularly for tow in conditions. The fuse can be blown during improper jump starting of the vehicle on the HHR and ION. Review Corporate Bulletin Number 05-02-32-002D to assure you do not have a blown 60 amp steering fuse. Use the appropriate recommendation based on what symptom has occurred. The following diagnostics might be helpful if the vehicle exhibits the condition(s) described above. Please discard Corporate Bulletin Number 07-02-32-007A (Section 02 - Steering). This bulletin is being revised to update the information for DTC C0475. Subject: Diagnostic Tips for Power Steering Inoperative/Steering Wheel Hard to Turn, Power Steering Message Displayed on DIC, DTCs C0176, C0475, C0476, C0550, U2105, U2107 Set #07-02-32-007B: Diagnostic Tips for Power Steering Inoperative/Steering Wheel Hard to Turn, Power Steering Message Displayed on DIC, DTCs C0176, C0475, C0476, C0550, U2105, U2107 Set - (Aug 6, 2009) The prior parts restriction on catalytic convertors has been canceled. Please refer to SI and follow the established diagnostics for correction of this customer concern. ![]() GM Engineering investigated vehicles with your assistance in the field, but did not identify a single-point issue (root cause) for this condition. Please discard Corporate Bulletin Number 08-06-05-002A (Section 06 - Engine). This bulletin is being revised to conclude the EI and end the parts restriction on catalytic convertors. ![]() Models: 2005-2007 Chevrolet Cobalt SS Supercharged ![]() Subject: EI08085 - 2.0L, MIL Lamp On, DTC P0420, Exhaust Noise, Poor Engine Performance (Engineering Information Closed) #08-06-05-002B: EI08085 - 2.0L, MIL Lamp On, DTC P0420, Exhaust Noise, Poor Engine Performance (Engineering Information Closed) - (Jun 3, 2009)
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