C0765 on 2017-2024 Cadillac XT5: TPMS and Key Fob Fault Guide

What's Unique About the 2017-2024 Cadillac XT5

The key thing to understand about the Cadillac XT5 and similar GM vehicles is that the Tire Pressure Monitoring System (TPMS) and the keyless entry system are integrated. Both the tire pressure sensors and the key fobs transmit their signals to a single module: the Remote Control Door Lock Receiver (RCDLR). This design means that a failure of the RCDLR can simultaneously cause a TPMS warning light with codes like C0765 and cause all key fob functions (lock, unlock, remote start) to stop working. This often leads to misdiagnosis, where a perfectly good TPMS sensor is replaced when the RCDLR is the actual culprit. TSB 16-NA-396 was issued by GM specifically to address this common pattern of symptoms and points directly to an internal RCDLR failure.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Tire pressure monitor (TPM) indicator light is on
• "Service Tire Monitor System" message on the driver information center (DIC)
• Key fob functions are inoperative (lock, unlock, remote start, panic).
• "No Remote Detected" message on the DIC.
• Intermittent no-crank or no-start condition with the security light on (less common, but noted in TSB PIC5650M).
• Passive entry system (touching the door handle to unlock) is not responsive.
• Tire pressure readings for one or more tires show as dashes (--) on the DIC.

Most Likely Causes

1. Faulty Remote Control Door Lock Receiver (RCDLR) 🔴 High Probability → Shop Keyless Entry Receiver This is a well-documented issue on many GM platforms from this era, including the XT5, as detailed in TSB 16-NA-396. The module itself can fail internally, causing a loss of communication with both TPMS sensors and key fobs.
   How to confirm: The strongest indicator is the simultaneous failure of key fob functions and the appearance of one or more TPMS codes (C0750, C0755, C0760, C0765). A professional scan tool may also show a specific sub-code like ':29 – Too Few Pulses' for the TPMS codes, which directly points to the RCDLR per the TSB. The RCDLR is typically located in the rear of the vehicle, often behind a side trim panel.
   Typical fix: Replace the RCDLR module and program the new one to the vehicle using GM-specific diagnostic software.
   Est. part cost: $50-$100
2. Dead or Faulty Left Rear TPMS Sensor 🟡 Medium Probability → Shop Tire Pressure Monitoring System (TPMS) Sensor TPMS sensor batteries have a finite lifespan, typically 5-10 years. As the 2017+ XT5 fleet ages, sensor battery failure becomes increasingly common.
   How to confirm: If the key fob works perfectly but code C0765 is present, the sensor is the primary suspect. A tire shop or a DIYer with a TPMS tool can attempt to activate or 'relearn' the sensor. If the left rear sensor fails to respond during the relearn procedure (the horn doesn't chirp to confirm), it has failed.
   Typical fix: Replace the left rear TPMS sensor. The tire must be unseated from the wheel to perform the replacement.
   Est. part cost: $40-$70
3. Radio Frequency Interference (RFI) ⚪ Low Probability GM TSB PIC5650M notes that aftermarket devices plugged into the vehicle (like phone chargers, dash cams, or even certain key fob accessories) can sometimes emit radio frequencies that 'jam' the signals from the TPMS sensors or key fobs, leading to intermittent codes and symptoms.
   How to confirm: Remove all aftermarket electronic devices from the vehicle and see if the problem disappears. This is often an intermittent issue that is hard to duplicate.
   Typical fix: Identify and remove the source of the interference.
   Est. part cost: $0
4. Poor or Disconnected RCDLR Antenna Connection ⚪ Low Probability TSB 16-NA-061 describes how the RCDLR's antenna system (coax cable, amplifier, and antenna in rear glass) can become disconnected, causing poor signal reception. A disconnected coax cable at the RCDLR itself can cause all TPMS sensors to stop reporting and severely limit key fob range.
   How to confirm: Inspect the coax cable connection at the RCDLR module. If the key fob only works very close to the vehicle and all TPMS sensors show dashes, this is a strong possibility.
   Typical fix: Securely reconnect the coax cable to the RCDLR module.
   Est. part cost: $0

Diagnosis Steps

1. Check for other symptoms. Does the key fob work? If not, immediately suspect the RCDLR.
2. If the key fob works, check the tire pressure display in the Driver Information Center. Does it show a reading for the left rear tire, or is it blank (--) ?
3. Attempt a TPMS relearn procedure. This can be initiated through the vehicle's DIC menu by navigating to the tire pressure screen and holding the select button. You will need a simple TPMS activation tool to trigger each sensor in sequence (LF, RF, RR, LR).
🎬 Watch a demonstration of the TPMS relearn and reset procedure.
4. If the relearn procedure fails at the left rear wheel (the horn doesn't chirp to confirm), the TPMS sensor for that wheel is bad and needs to be replaced.
5. If multiple or all sensors fail to relearn, and especially if the key fob is inoperative, the RCDLR is the most likely cause.
6. Scan the vehicle with a professional-grade tool. Look for codes C0750, C0755, C0760, and C0765. Check for symptom codes like ':29' (Too Few Pulses), which strongly points to the RCDLR per TSB 16-NA-396.
7. Inspect for aftermarket electronic devices (chargers, dash cams, etc.) and remove them to rule out Radio Frequency Interference (RFI) as noted in TSB PIC5650M.
8. If symptoms point to a global signal loss, inspect the coax antenna connection at the RCDLR module before replacing it, per TSB 16-NA-061.

Parts You'll Likely Need

• Remote Control Door Lock Receiver (RCDLR) (OEM #13595511) — This is the most common cause when TPMS code C0765 is accompanied by key fob failure, as documented in TSB 16-NA-396. Note: This part may be superseded by part number 13540045.
  Trusted brands: ACDelco, GM Genuine
  OEM price range: $50-$90
  Aftermarket price range: $40-$80
• Tire Pressure Monitoring System (TPMS) Sensor (OEM #84961888) — If the key fob works fine, the sensor itself has likely failed due to an expired internal battery.
  Trusted brands: ACDelco, Schrader, Bosch, Dorman
  OEM price range: $40-$70
  Aftermarket price range: $30-$50

Related Codes That Often Appear With This One

• C0750, C0755, C0760 — These are the codes for the other three tire pressure sensors (Left Front, Right Front, Right Rear). When all four codes appear together, it strongly suggests a failure of the common receiver (the RCDLR) rather than four simultaneous sensor failures.
• B3055, B3060, B3935 — These are security and key-related codes. TSB PIC5650M links them with the TPMS codes, suggesting a broader system failure related to the RCDLR and its role in vehicle security and starting.

Technical Service Bulletins (TSBs) & Recalls

• 16-NA-396: Intermittent Operation of Key Fobs, Door Unlock Inoperative “No Remote Detected” Message with Possible TPM MIL. Points to a faulty RCDLR as the cause.
• PIC5650M: Intermittent no crank, no start, or start stall concern with the security light coming on, potentially with code C0765. Suggests checking for RFI.
• 16-NA-061: Service Tire Monitor System/ Tire Pressures Display Dashes/ RKE Short Range/ No Fob Detected Message. Points to checking the RCDLR antenna connections.

Platform-Specific Known Issues

• TSB 16-NA-396: This bulletin directly addresses the condition where intermittent key fob operation, a 'No Remote Detected' message, and TPMS codes (including C0765 with symptom code :29) are caused by an internal failure of the Remote Control Door Lock Receiver. The fix is to replace the RCDLR.
• TSB PIC5650M: This bulletin discusses intermittent no-start or stalling conditions with a security light, which can be accompanied by a range of codes including C0765. It suggests investigating Radio Frequency Interference from aftermarket devices as a possible cause before replacing parts.
• TSB 16-NA-061: This bulletin explains that symptoms identical to a failed RCDLR (TPMS codes, no fob detection) can also be caused by a disconnected antenna coax cable at the RCDLR module, which should be checked before replacing the part.

Hidden / Shadow Codes Worth Checking

• C0765 03: Left Rear Tire Pressure Sensor Low Voltage. This indicates a potential issue with the sensor's power supply or an internal short. (see via A professional-grade scan tool capable of reading GM-specific Body Control Module (BCM) codes and their symptom bytes.)
• C0765 29: Left Rear Tire Pressure Sensor Too Few Pulses. This is the specific code mentioned in TSB 16-NA-396 that strongly points to a faulty RCDLR rather than a sensor issue. (see via A professional-grade scan tool capable of reading GM-specific Body Control Module (BCM) codes and their symptom bytes.)
• C0765 39: Left Rear Tire Pressure Sensor Internal Malfunction. This indicates the sensor has failed its own internal self-check. (see via A professional-grade scan tool capable of reading GM-specific Body Control Module (BCM) codes and their symptom bytes.)

Scan Tool Commands That Help

• GDS2 (Global Diagnostic System 2): RCDLR Module Setup/Programming — This multi-step process is required after physically replacing the RCDLR. It involves setting up the new module, performing a Theft Deterrent System relearn (10 or 30-minute procedure), and finally, learning the tire pressure sensors to the new module.

Wiring & Ground Locations

• RCDLR Antenna System — The RCDLR module is located in the rear of the vehicle. Its antenna system consists of a coax cable running to an antenna amplifier module, which then connects to an antenna integrated into the right rear glass.. A disconnect at any point in this system can cause TPMS codes and key fob issues. Per TSB 16-NA-061, a full disconnect at the RCDLR will cause all TPMS sensors to fail and key fobs to only work inside the car. A disconnect further away, at the amplifier, may only cause intermittent issues with sensors farthest from the receiver (e.g., the front tires).

OEM Part Supersession History

• 13595511 → 13540045 — Standard part revision or manufacturer change.