C0750 on 2007-2013 Cadillac Escalade EXT: Left Front TPMS Fault Causes and Fixes

What's Unique About the 2007-2013 Cadillac ESCALADE EXT

On this generation of GM trucks and SUVs (GMT900 platform), the Tire Pressure Monitoring System (TPMS) is integrated with the Remote Control Door Lock Receiver (RCDLR), the same module that receives signals from your key fobs. A unique and well-documented issue is that a failing RCDLR can cause both TPMS codes (like C0750) and a complete loss of key fob functionality, which can even lead to a no-start condition. This is confirmed by manufacturer Technical Service Bulletins (TSB #PIC5650M and #16-NA-396) that link TPMS codes to RCDLR failure and related symptoms. The RCDLR module is physically located behind the interior trim in the driver's side rear of the cabin (D-pillar area). Therefore, diagnosing C0750 on an Escalade requires checking key fob operation before assuming the tire sensor is bad.

Diagnostic Flowchart

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

Symptoms You May Notice

• TPMS warning light on the dashboard (often flashes for one minute, then stays solid).
• "Service Tire Monitor System" message on the Driver Information Center (DIC).
• The pressure reading for the left front tire shows as dashes (--) on the DIC.
• In cases of RCDLR failure, key fobs (lock/unlock/remote start) will not work or will have severely limited range.
• In rare cases linked to TSBs, a "No Remote Detected" message may appear, leading to a no-start condition.

Most Likely Causes

1. Dead TPMS Sensor Battery 🔴 High Probability → Shop Tire Pressure Monitoring System (TPMS) Sensor TPMS sensors use sealed, non-rechargeable batteries with a finite lifespan, typically 7-10 years. Vehicles in the 2007-2013 range are now at an age where battery failure is very common.
   How to confirm: Use a TPMS diagnostic tool to attempt to activate the sensor. If the tool cannot get a reading or shows a 'low battery' status in the scan tool data, the sensor has failed. This is the most definitive test.
   Typical fix: Replace the left front TPMS sensor and perform the TPMS relearn procedure using either the DIC method (letting air out of tires) or a TPMS activation tool. 🎬 See how to perform a simple TPMS relearn at home.
   Est. part cost: $30-$80
2. Failed Remote Control Door Lock Receiver (RCDLR) 🟡 Medium Probability → Shop Keyless Entry Receiver This module is a known failure point on the GMT900 platform, causing a cluster of seemingly unrelated issues. TSBs have been issued for this problem, and it is widely discussed in owner forums.
   How to confirm: Check for simultaneous failure of all TPMS sensors (codes C0750, C0755, C0760, C0765) and verify that key fob functions are also dead or extremely weak. If both systems fail together, the RCDLR is the prime suspect. 🎬 Watch: How to fix combined TPMS and remote entry issues. A scan tool may also show that the RCDLR module is unresponsive.
   Typical fix: Replace the RCDLR module located behind the driver's side rear interior panel. This new module must be programmed to the vehicle by a dealer or a shop with GM programming capabilities (SPS).
   Est. part cost: $70-$150

Rare But Worth Checking

• Physical Sensor Damage: The sensor can be easily damaged during tire mounting, dismounting, or from a severe pothole impact. Inspect the sensor if the tire has been recently serviced.
• Radio Frequency (RF) Interference: Aftermarket electronic devices like cheap phone chargers, dash cams, or LED lighting can sometimes emit RF noise that interferes with the TPMS and key fob signals. TSB PIC5650K specifically calls out this issue. Try unplugging all aftermarket devices to see if the code clears.
• Use of Unapproved Tire Sealant: Tire sealants (like Fix-a-Flat) that are not 'TPMS-safe' can clog the pressure-sensing port on the sensor, causing it to fail.
• Disconnected RCDLR Antenna: TSB 16-NA-061 notes that the coax cable connecting the RCDLR to its antenna (often in the rear glass) can become disconnected at the module, at the antenna amplifier, or at the glass itself, causing poor reception and TPMS codes.

Diagnosis Steps

1. Check the tire pressure in all four tires manually with a quality gauge to rule out an actual low-pressure situation.
2. Check the function of your key fobs (lock, unlock, remote start). If they do not work, or only work very close to the vehicle, suspect the RCDLR module or its antenna connection.
3. If key fobs work, use a TPMS diagnostic tool to attempt to read the left front sensor directly. This will confirm if the sensor is transmitting and check its battery status.
4. If the sensor does not respond to the tool, it needs to be replaced.
5. If the sensor responds but the code persists, or if key fobs are inoperative, inspect the RCDLR module and its wiring. It is located behind the driver's side rear interior trim panel (D-pillar). Check for loose connections, especially the antenna coax cable, and signs of water intrusion.
6. Unplug any and all aftermarket 12V accessories (phone chargers, dash cams, LED lights) and see if function returns, as they can cause RF interference.
7. If multiple TPMS codes are present and key fobs are dead, proceed with diagnosing and likely replacing the RCDLR. This requires a scan tool capable of communicating with the BCM and RCDLR.

Parts You'll Likely Need

• Tire Pressure Monitoring System (TPMS) Sensor (OEM #13598771) — This is the most common failure point. The internal battery dies, requiring replacement of the whole sensor unit. The original part number 13586335 has been superseded by 13598771.
  Trusted brands: ACDelco, Schrader, Standard Motor Products
  OEM price range: $50-$90
  Aftermarket price range: $25-$50
• Remote Control Door Lock Receiver (RCDLR) (OEM #25974394, 22868117, 15857831) — This module is the second most likely cause, especially if key fobs are also inoperative. Part numbers vary by specific year and options, so it's critical to verify with a VIN at a dealership. Using an incorrect part number, even one listed as compatible, can cause issues.
  Trusted brands: ACDelco (OEM)
  OEM price range: $70-$150
  Aftermarket price range: $50-$100

Related Codes That Often Appear With This One

• C0755, C0760, C0765 — These are the codes for the other three wheel sensors (Right Front, Left Rear, Right Rear). If all four appear together, it strongly points to a central issue like a faulty RCDLR module rather than four simultaneously failed sensors.
• B3055, B3060, B3935 — As cited in TSB #PIC5650M, these security and key-related codes can appear with C0750 when there is a no-start or security system fault, often caused by RF interference or a module communication issue.
• U0422 — This code indicates 'Invalid Data Received From Body Control Module'. It can be logged along with the TPMS and RCDLR-related codes, pointing to a communication breakdown between the BCM and the RCDLR, a common scenario when the RCDLR fails.

Technical Service Bulletins (TSBs) & Recalls

• PIC5650M (and its revisions like K): Primarily addresses intermittent no-crank/no-start conditions and security DTCs, but lists C0750 as a potential accompanying code. It strongly points to Radio Frequency Interference (RFI) from aftermarket devices as a cause.
• 16-NA-396: Details the exact failure mode of the RCDLR causing both TPMS codes and key fob inoperability on other GM vehicles, directing technicians to replace the RCDLR if these symptoms are present together.
• 16-NA-061: Describes how a disconnected or poor antenna connection for the RCDLR can cause TPMS codes and poor key fob range, advising inspection of the coax cable before module replacement.
• PIC6047A: While for other GM models, it notes a rare issue where the OnStar module can interfere with the TPMS relearn process, which could be relevant if relearning fails after a sensor or RCDLR replacement.

Platform-Specific Known Issues

• A known issue, documented in TSB #PIC5650M, links TPMS codes like C0750 to intermittent no-crank, no-start, or stalling conditions accompanied by the security light, often caused by Radio Frequency Interference.
• The RCDLR module, which processes both TPMS and key fob signals, can fail and cause both systems to become inoperative simultaneously. This is a widely reported failure on the GMT900 platform.
• The location of the RCDLR behind the rear interior trim can make it susceptible to damage or loose connections if other work has been performed in that area, or potentially from water leaks around the rear glass.

Mechanic-Grade Diagnostic Values

• TPMS Sensor Signal Frequency — expected: 315 MHz. Failure: No signal detected by a TPMS tool.
• RCDLR Module Battery Positive Voltage — expected: 12V+ DC. Failure: Low or no voltage at the RD/WH (Red/White) wire on the RCDLR connector.
• RCDLR Module Ground — expected: Good continuity to chassis ground.. Failure: High resistance on the BK/WH (Black/White) wire at the RCDLR connector.
• TPMS Sensor Battery Voltage (via Scan Tool) — expected: OK / Good. Failure: Scan tool data list for the RCDLR shows 'Low Battery' for the specific sensor.

Hidden / Shadow Codes Worth Checking

• C0750 08: Indicates 'Bus Signal/Message Failure' or 'Signal Invalid'. This means the RCDLR is receiving a signal, but it's corrupt or not in the expected format. (see via A professional GM scan tool like a Tech 2 or GDS2 that can read chassis codes with their symptom bytes.)
• C0750 29: Indicates 'Too Few Pulses'. This specific symptom byte is mentioned in TSB 16-NA-396 and strongly points towards an internal fault or significant reception issue with the Remote Control Door Lock Receiver (RCDLR), often appearing with all four sensor codes (C0750, C0755, C0760, C0765). (see via A professional GM scan tool like a Tech 2 or GDS2.)
• C0750 03: Indicates 'Voltage Below Threshold'. This directly points to the BCM detecting that the sensor's internal battery voltage is too low for reliable operation. (see via A GM-specific scan tool like a Tech2 or high-end aftermarket scanner capable of reading BCM symptom bytes.)

Scan Tool Commands That Help

• GDS2 / Tech2: Module Diagnostics > RCDLR > Data Display — To view live data from the RCDLR, including the status of each TPMS sensor, their unique IDs, pressure readings, and battery status. This is the primary step to confirm which sensor is not reporting.
• GDS2 / Tech2: Special Functions > Tire Pressure Monitor > TPMS Learn Mode — To command the vehicle into the TPMS relearn mode after replacing a sensor or the RCDLR module. This is the most reliable method to ensure the new sensor IDs are programmed correctly.
• GDS2 / Tech2: Module Diagnostics > RCDLR > Configuration/Reset Functions > Program Transmitters — After replacing the RCDLR module, this function is required to program the existing key fobs to the new module.
• GDS2 / SPS: Service Programming System (SPS) > Replace and Program ECU — This is required when a new RCDLR is installed. The module must be programmed with the vehicle's VIN and correct software calibration to function. This requires an online subscription to GM's service.

Wiring & Ground Locations

• RCDLR Power Feed — A RD/WH (Red/White) wire running from the 'DSM' fuse (10A) in the instrument panel fuse box directly to the RCDLR connector.. A break or corrosion in this wire will cause a total loss of power to the RCDLR, disabling both TPMS and key fob functions, mimicking a failed module.
• G302 — A ground stud located on the front door sill area, under the seat on the passenger side.. This is the main ground point for the RCDLR module via a BK/WH (Black/White) wire. A loose or corroded ground here will cause intermittent or total failure of the RCDLR.
• RCDLR Antenna — The antenna is integrated into the rear glass, connected by a coax cable to an amplifier module, which then connects to the RCDLR itself, located in the driver's side D-pillar.. A disconnected coax cable at any of these three points (glass, amplifier, or RCDLR) will cause poor signal reception, leading to intermittent or constant TPMS codes and poor key fob range, as detailed in TSB 16-NA-061.

Real Owner Repair Stories

• TahoeYukonForum.com user 'cnc-97' (2009 Cadillac Escalade ESV (Limousine Conversion)) — TPMS system not working and keyless entry not working.
  ❌ Tried (didn't work) Pulling the 10-amp 'DSM' fuse to reset the module., Unplugging the RCDLR module to 'wake it up' on re-installation.
  ✅ What actually fixed it Replaced the original RCDLR with a used one from a 2011 Impala (Part number was different but had a specific arrow marking). The TPMS and key fobs worked immediately after plugging in the replacement module and performing the programming/relearn procedures.
• MHH AUTO forum user 'TallersDiesel' (2009 Cadillac Escalade) — No key fob function and TPMS issues.
  ❌ Tried (didn't work) Initial diagnosis pointed to a failed RCDLR module.
  ✅ What actually fixed it The technician found there was no 12V+ power at the RCDLR connector. By supplying temporary power from another module, all functions were restored. The root cause was a break in the power wire between the fuse box and the RCDLR module, not a failed module itself.

When the Usual Fixes Don't Work

• While replacing the TPMS sensor is the most common fix for a single C0750 code, a significant number of owner and technician reports indicate that when the code is accompanied by key fob issues, the root cause is often not the sensor but a failure in the RCDLR's power supply or the RCDLR module itself. One technician traced the issue to a broken power wire feeding the module, completely avoiding a module replacement. Another owner successfully used a module from a completely different vehicle (an Impala) to resolve their problem, highlighting that part interchangeability can be complex and not always follow official guidance.

OEM Part Supersession History

• 13586335 → 13598771, 13598772, 23445327, and others — Standard part evolution and consolidation.
  Heads up: These are generally cross-compatible for the 2007-2013 Escalade, but it's crucial to ensure the sensor operates at 315 MHz, as some other GM vehicles use 433 MHz.
• 15857831 (and others) → 25974394, 22868117 — Updated internal components or software revisions.
  Heads up: A forum member explicitly warns *not* to use an 'upgraded' or superseded part number when replacing the RCDLR, as they had significant trouble getting it to work, suggesting it's best to match the original part number exactly or use a known-compatible used part.