Low Tire Pressure Sensors Not Learned

What C0775 means

On these GM vehicles the tire pressure sensors report by radio to a receiver module (on the Acadia-era platform this is the remote control door lock receiver, or RCDLR, which doubles as the TPMS receiver). Each sensor has a unique ID and a position — left front, right front, and so on — that the module must learn. C0775 sets when that learn procedure has not been completed, so the module doesn't know which sensor is at which corner, for example after rotating tires, installing new sensors, or fitting a new receiver module. It is a 'not learned' configuration state, not a wiring or sensor-circuit failure.

Symptoms

• The low-tire / TPMS warning icon flashes for about a minute at startup, then stays on steady
• Driver information center shows a Service Tire Monitor System type message
• Individual tire pressures are not displayed, or show dashes, on the driver information center
• Appears right after a tire rotation, sensor replacement, or receiver-module replacement
• The system won't warn you about a genuinely low tire until the sensors are relearned

Common causes

• The tire pressure sensor learn procedure was never completed after service — the main cause
• Tires were rotated without relearning the sensor positions
• One or more TPMS sensors were replaced and not learned to the module
• A new receiver / RCDLR module was installed — it sets C0775 on its first key-on until learned
• The learn procedure was started but not finished for all four sensors (it timed out partway)
• A weak or dead sensor battery, or a relearn tool that failed to activate a sensor, so that corner never learned

Severity & driving advice

Severity: Low — Not a breakdown — the system just needs its sensors relearned. Braking and driving are unaffected, but low-tire warnings won't work until you do.

Can I drive? Perfectly drivable — this is a relearn/config code, not a mechanical fault. The only real risk is the system won't alert you to a low tire until the sensors are relearned, so check your pressures by hand and run the relearn procedure soon.

Diagnostic approach

1. Confirm it's a relearn code, not a sensor failure — Read the TPMS codes with a capable scan tool. C0775 on its own means 'sensors not learned' — check whether any sensor-specific fault codes are also present before assuming a bad sensor, because the fix is usually just the learn procedure.
2. Set every tire to the correct pressure — Inflate all tires (including the spare if it carries a sensor) to the placard pressure first, so the learn runs smoothly and no genuine low-pressure warning interferes with the procedure.
3. Enter the tire pressure sensor learn mode — Use the GM method — typically turn the ignition to ON/RUN with the engine off and use the driver information center menu or the keyfob Lock/Unlock sequence to put the receiver into learn mode. A horn chirp confirms the module is ready to learn.
4. Learn each sensor in the correct order — Starting at the left front and moving to right front, right rear, then left rear, activate each sensor with a TPMS relearn/activation tool (or the approved air-release method). The horn chirps as each sensor ID is accepted at that position.
5. Confirm the learn completed — After all four are accepted the module exits learn mode. Verify the driver information center now shows the four pressures and the TPMS light is off, then cycle the ignition — the code clears once the module has been learned and one ignition cycle has passed.
6. If it returns, test the module and sensors — If you relearn correctly and C0775 comes back, the receiver / RCDLR itself is suspect and may need replacement, setup, and programming per GM. Also confirm each sensor is alive, since a dead sensor battery will keep one corner from ever learning.

Make & model notes

Chevrolet: On Chevrolet models (Silverado, Tahoe, Traverse and similar) C0775 is 'sensors not learned,' distinct from the C0750/C0755/C0760/C0765 corner codes. It most often appears after a receiver or sensor change; running the relearn in the LF-RF-RR-LR order usually clears it without any parts.

GMC: GMC uses the same GM TPMS logic (verified on the Acadia): a newly replaced RCDLR sets C0775 on its first ignition ON cycle, and the tire pressure sensor learn procedure must be performed. If the code returns after a clean relearn, replace the RCDLR receiver.

FAQ