P0AC4 on the 2014 Cadillac ELR
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
Nobody has written a description of this code yet.
| PIP5202C | 2020-06-15. Service bulletin. This Preliminary Information communication provides information to the technician the steps to diagnose and repair vehicles that have Check Engine Light illuminated with an "Engine Unavailable" and "Reduced Propulsion" messages on the Driver Information Center. Technician may find Diagnostic Trouble Codes a P0AB9 and P0AC4. Technician should not clear any Diagnostic Trouble Codes and ensure Global Diagnostic System 2 is up to date. Technician will need to use Global Diagnostic System 2 and check all modules for Diagnostic Trouble Codes. Now use Global Diagnostic System 2 to create freeze frame data from Hybrid Powertrain Control Module and the Engine Control Module and save a report. Technician will need to verify that the vehicle had not been run very low or out of fuel. Also verify the customer did not press the Power Button causing the vehicle to turn off while driving. Verify that the Internal Combustion Engine runs properly and no other engine related or communication related Diagnostic Trouble Codes are present. Technician should inquire if the remote star was used on the last two drive cycles before the Diagnostic Trouble Code set. Technician should update the Engine Control Module if so. Technician should inspect the ground locations G106 (engine block) and G113 (drive unit case) have been cleaned and are secure making sure the ground eyelets do not spin. Technician should also check for past service history for prior mechanical engine or wiring harness repairs. Inspect the cam timing connector and repair any damage. |
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| PIP5202B | 2019-06-03. Service bulletin. This Preliminary Information communication provides information to the technician the steps to diagnose and repair vehicles that have Check Engine Light illuminated with an "Engine Unavailable" and ?Reduced Propulsion? messages on the Driver Information Center. Technician may find Diagnostic Trouble Codes a P0AB9 and P0AC4. Technician should not clear any Diagnostic Trouble Codes and ensure Global Diagnostic System 2 is up to date. Technician will need to use Global Diagnostic System 2 and check all modules for Diagnostic Trouble Codes. Now use Global Diagnostic System 2 to create freeze frame data from Hybrid Powertrain Control Module and the Engine Control Module and save a report. Technician will need to verify that the vehicle had not been run very low or out of fuel. Also verify the customer did not press the Power Button causing the vehicle to turn off while driving. Verify that the Internal Combustion Engine runs properly and no other engine related or communication related Diagnostic Trouble Codes are present. Technician should inquire if the remote star was used on the last two drive cycles before the Diagnostic Trouble Code set. Technician should update the Engine Control Module if so. Technician should inspect the ground locations G106 (engine block) and G113 (drive unit case) have been cleaned and are secure making sure the ground eyelets do not spin. Technician should also check for past service history for prior mechanical engine or wiring harness repairs. Inspect the cam timing connector and repair any damage. |
| PIP5202A | 2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician the steps to diagnose and repair vehicles that have Check Engine Light illuminated with an "Engine Unavailable" and ?Reduced Propulsion? messages on the Driver Information Center. Technician may find Diagnostic Trouble Codes a P0AB9 and P0AC4. Technician should not clear any Diagnostic Trouble Codes and ensure Global Diagnostic System 2 is up to date. Technician will need to use Global Diagnostic System 2 and check all modules for Diagnostic Trouble Codes. Now use Global Diagnostic System 2 to create freeze frame data from Hybrid Powertrain Control Module and the Engine Control Module and save a report. Technician will need to verify that the vehicle had not been run very low or out of fuel. Also verify the customer did not press the Power Button causing the vehicle to turn off while driving. Verify that the Internal Combustion Engine runs properly and no other engine related or communication related Diagnostic Trouble Codes are present. Technician should inquire if the remote star was used on the last two drive cycles before the Diagnostic Trouble Code set. Technician should update the Engine Control Module if so. Technician should inspect the ground locations G106 (engine block) and G113 (drive unit case) have been cleaned and are secure making sure the ground eyelets do not spin. Technician should also check for past service history for prior mechanical engine or wiring harness repairs. Inspect the cam timing connector and repair any damage. |
| PIP5202 | 2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician the steps to diagnose and repair vehicles that have Check Engine Light illuminated with an "Engine Unavailable" and "Reduced Propulsion" messages on the Driver Information Center. Technician may find Diagnostic Trouble Codes a P0AB9 and P0AC4. Technician should not clear any Diagnostic Trouble Codes and ensure Global Diagnostic System 2 is up to date. Technician will need to use Global Diagnostic System 2 and check all modules for Diagnostic Trouble Codes. Now use Global Diagnostic System 2 to create freeze frame data from Hybrid Powertrain Control Module and the Engine Control Module and save a report. Technician will need to verify that the vehicle had not been run very low or out of fuel. Also verify the customer did not press the Power Button causing the vehicle to turn off while driving. Verify that the Internal Combustion Engine runs properly and no other engine related or communication related Diagnostic Trouble Codes are present. Technician should inquire if the remote star was used on the last two drive cycles before the Diagnostic Trouble Code set. Technician should update the Engine Control Module if so. Technician should inspect the ground locations G106 (engine block) and G113 (drive unit case) have been cleaned and are secure making sure the ground eyelets do not spin. Technician should also check for past service history for prior mechanical engine or wiring harness repairs. Inspect the cam timing connector and repair any damage. |
| PIC5988 | 2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician about vehicle that may have the following Diagnostic Trouble Codes U0401, U0140, P15F6, P1E00, U0100, P0562, P1553, P0AC4, C0110, C0898, P1EFC, P257F, P150D, P150E, C0899, U1860, U0293, C0196, P069E, U2608, U0101, U186B, P1ADE, P1AE0, P1E19, U0073, P1EDD, U0417, U184D, U1858, and C12E0 set as Passed /Failed. Technician will need to contact General Motors Technical Assistance Center for further assistance. |
| PIP5008A | 2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that have a Check Engine Malfunction Indicator Lamp on and possibly an Engine Unavailable message on the Driver Information Center. Technician may find Diagnostic Trouble Code?s P0AB9 in set in the Hybrid Powertrain Control Module and P0AC4 set in the Engine Control Module. Technician should not clear any Diagnostic Trouble Codes. Technician will need to verify that the vehicle has not been run very low or out of fuel, customer did not key off while driving, and the engine runs properly and no other engine related or communication related Diagnostic Trouble Codes are present. Technician will need to check for clean and tight ground location G106 and G113. |
6 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.