C1288 on GMC Acadia
Factory diagnostic protocol and troubleshooting wire for fault code C1288 specifically for the GMC Acadia (2021–2026, 2.5L Turbo 4-Cyl (328HP) / 3.6L V6 (310HP AWD)).
1. Symptoms of C1288 on GMC Acadia
When the Engine Control Module (ECM/PCM) on your GMC Acadia (2.5L Turbo 4-Cyl (328HP) / 3.6L V6 (310HP AWD)) logs fault code C1288, drivers commonly observe:
2. Most Likely Causes on GMC Acadia
Historical warranty claims and technical repair bulletins for GMC Acadia point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for GMC Acadia
Monitor brake pressure transducer PID. It should read near 0 bar unpressed and climb smoothly to 80+ bar when pressing pedal. on the GMC Acadia equipped with 2.5L Turbo 4-Cyl (328HP) / 3.6L V6 (310HP AWD).
Unplug ABS connector and check for bent pins or brake fluid contamination. on the GMC Acadia equipped with 2.5L Turbo 4-Cyl (328HP) / 3.6L V6 (310HP AWD).
Replace the ABS HCU / pump assembly or send unit to a certified rebuilder to replace the internal pressure transducer. on the GMC Acadia equipped with 2.5L Turbo 4-Cyl (328HP) / 3.6L V6 (310HP AWD).
Run scan tool automated bleed procedure to purge air from ABS valves, then bleed all 4 calipers. on the GMC Acadia equipped with 2.5L Turbo 4-Cyl (328HP) / 3.6L V6 (310HP AWD).
Clear DTCs and road test to verify AdvanceTrac operation. on the GMC Acadia equipped with 2.5L Turbo 4-Cyl (328HP) / 3.6L V6 (310HP AWD).
Equipment for Diagnosing GMC Acadia (C1288)
GMC Acadia OEM Replacement Sensor
Direct-fit replacement assembly engineered to OEM tolerances for GMC Acadia.
AstroAI Auto-Ranging Digital Multimeter
Essential for testing 0.1V–5.0V sensor reference signals, ground continuity (<0.20Ω), and harness resistance.
BlueDriver Bluetooth Pro OBDII Scan Tool
Reads and clears enhanced codes (ABS, Airbag, Transmission, Engine) & live freeze-frame telemetry on phone.
Other Common Fault Codes on GMC Acadia
Frequently diagnosed powertrain, emissions, and sensor trouble codes logged on the GMC Acadia:
4. GMC Acadia C1288 FAQs
What causes code C1288 to trigger on a GMC Acadia?
On the GMC Acadia (2.5L Turbo 4-Cyl (328HP) / 3.6L V6 (310HP AWD)), C1288 is most frequently caused by Failed internal brake pressure transducer inside the ABS Hydraulic Control Unit (HCU) or Corroded pins in ABS module electrical connector.
Where is the OBD-II port located on my GMC Acadia?
On the GMC Acadia, the 16-pin DLC diagnostic connector is located Driver lower knee panel. Plug in any standard OBD-II scanner with the ignition in the ON position to read freeze-frame parameters.
Can I safely drive my GMC Acadia with code C1288?
Caution. Normal hydraulic brakes work, but ABS, Traction Control, and AdvanceTrac are disabled. Given that C1288 carries a High severity rating, we advise avoiding heavy towing or aggressive throttle inputs until sensor readings are verified.