Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN K2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1942 (HYBRID/EV CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P1A88CIRCUIT/SYSTEM VERIFICATION
2006 Chevrolet Suburban K2500, 6.0 U
Circuit/System Verification
2006 Chevrolet Suburban K2500, 6.0 USECTION Circuit/System Verification
WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
- Verify there is no other hybrid DTCs set.
- If other Hybrid DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Ignition ON, engine OFF, observe the scan tool battery energy control module contactor system status parameter. The status should display closed.
- If not the specified value, refer Symptoms - Hybrid Controls .
- Verify that DTC P1A88 is not set as current.
- If the DTC is set as current, replace the K1 accessory DC power control module.
- Ignition OFF, disconnect the X2 harness connector at the K1 accessory DC power control module.
- Ignition ON, engine OFF, command the accessory DC power control module Intermediate Voltage Control ON with a scan tool. Test for 42V between the K1 accessory DC power control module X2 terminal 1 and 2. The reading should be between 40 V and 44 V.
- If not within the specified range, replace the K1 accessory DC power control module.
- Ignition OFF, connect the X2 harness connector at the K1 accessory DC power control module.
- Ignition ON, engine OFF, command the accessory DC power module Intermediate Voltage Control ON with a scan tool. Verify the 42V circuit parameter between 40 V and 44 V.
- If not within the specified range, replace the M38 power steering assist motor.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.