C0750 on 2007-2014 Cadillac Escalade: TPMS Faults, Causes, and Fixes

What's Unique About the 2007-2014 Cadillac ESCALADE

On this generation of Cadillac Escalade and related GM trucks (the GMT900 platform), the Tire Pressure Monitoring System (TPMS) and the keyless entry system are linked. Both the tire sensors and the key fobs transmit their signals to the same module: the Remote Control Door Lock Receiver (RCDLR). Because of this shared architecture, a failure within the RCDLR module can cause a confusing set of symptoms. It's common to see all four TPMS codes (C0750, C0755, C0760, C0765) appear at once, along with key fobs that don't work and even no-start conditions, as documented in GM Technical Service Bulletin #PIC5650M. In some cases, the issue may not be the module itself but a poor or disconnected antenna connection leading to it.

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 flashing for about a minute at startup, then staying on solid.
• "Service Tire Monitor System" message on the Driver Information Center (DIC).
• DIC showing dashes "--" for the left front tire pressure reading.
• Inoperative key fobs (if the RCDLR module is the root cause).
• Intermittent no-crank or no-start condition with security light illuminated (per TSB PIC5650M).
• "No Fob Detected" message on the DIC.

Most Likely Causes

1. Dead Battery in TPMS Sensor 🔴 High Probability TPMS sensor batteries have a finite lifespan, typically 7-10 years. For this vehicle range, many original sensors are at or beyond their expected service life. A low battery condition is a specific trigger for setting this DTC.
   How to confirm: A professional tire shop or a technician with a TPMS diagnostic tool can trigger the sensor and read its battery status directly. If the tool cannot get a response from the sensor, it has failed. This is the most likely cause if C0750 appears alone.
   Typical fix: Replace the left front TPMS sensor and perform the TPMS relearn procedure. While the battery itself is not officially replaceable, the entire sensor unit must be changed. 🎬 See this walkthrough on replacing a GM TPMS sensor
   Est. part cost: $40-$90
2. Faulty Remote Control Door Lock Receiver (RCDLR) 🟡 Medium Probability This module is a known failure point that can cause widespread communication issues. TSB #PIC5650M and TSB #16-NA-396 specifically link multiple TPMS codes to starting and key fob issues, pointing towards a central module fault.
   How to confirm: This is the likely cause if C0750 appears with all other TPMS codes (C0755, C0760, C0765) and is accompanied by key fob and/or starting problems. A scan tool can be used to check for communication with the RCDLR. On the Escalade, the RCDLR is located in the driver's rear quarter panel area, behind the interior trim.
   Typical fix: Replace the RCDLR module. This part must be programmed to the vehicle by a dealer or a qualified shop with GM diagnostic software. In some cases, simply unplugging the module or pulling the 'DSM' fuse can temporarily reset it, but replacement is often necessary.
   Est. part cost: $70-$150
3. Damaged TPMS Sensor or Valve Stem ⚪ Low Probability Sensors can be damaged during tire changes. The valve stems, especially the metal type, can corrode from road salt and moisture, leading to air leaks or damage to the sensor seal.
   How to confirm: Visual inspection of the valve stem for corrosion or damage. If a tire was recently replaced, damage during service is a possibility. The fault will typically appear immediately after the tire service.
   Typical fix: Replace the damaged sensor or the TPMS service kit (valve stem, core, nut, and seals).
   Est. part cost: $10-$25 for a service kit, $40-$90 for a full sensor.

Rare But Worth Checking

• Radio Frequency (RF) Interference: Uncommon, but aftermarket electronic devices plugged into the vehicle's power outlets (like phone chargers, dash cams, or even some LED bulbs) can emit RF interference that disrupts the 315 MHz signal between the TPMS sensors and the RCDLR. TSB #PIC5650K details this issue and suggests removing such devices for diagnosis.
• Faulty RCDLR Antenna or Wiring: A less common but possible cause is a disconnected or faulty antenna coax cable running to the RCDLR module. TSB 16-NA-061 describes how a disconnected antenna can cause intermittent loss of signal from the sensors furthest from the module, such as the left front. A user on Tahoe Yukon Forum reported that broken wiring in the driver's door jamb was the ultimate cause of their RCDLR failure.

Diagnosis Steps

1. Scan for all DTCs. Note if C0750 is present alone or with other TPMS codes (C0755, C0760, C0765) and/or Body Control Module (BCM) codes like B3055. Note any symptom bytes, such as :00, :03, :08, or :29.
2. Test Key Fob Function. Check if the remote lock, unlock, and start functions are working correctly. If they are intermittent or dead, and multiple TPMS codes are present, suspect the RCDLR.
3. Check Sensor Data (if C0750 is isolated). Use a TPMS diagnostic tool (like an Autel or Schrader tool) to attempt to read the left front sensor. Check its reported pressure, temperature, and crucially, its battery status. If the tool cannot get a signal, the sensor has failed.
4. Inspect for RF Interference. Unplug all aftermarket 12V accessories (phone chargers, dash cams, etc.) and remove any non-factory key fobs or access cards from the vehicle. Clear codes and re-drive to see if the fault returns.
5. Inspect the Valve Stem. Visually check the left front valve stem for obvious corrosion, cracks, or damage, which could indicate a physically failed sensor.
6. Diagnose RCDLR (if suspected). If multiple symptoms point to the RCDLR, diagnosis will require a high-end scan tool to check for communication with the module and perform system tests. A technician may also check the RCDLR antenna connection behind the right rear glass trim and wiring in the driver's door jamb. This step is best left to a professional.
7. Perform TPMS Relearn. After replacing a sensor, a TPMS relearn procedure must be performed to register the new sensor ID 🎬 Watch: How to perform a simple TPMS relearn procedure with the vehicle's computer.

Parts You'll Likely Need

• Tire Pressure Monitoring System (TPMS) Sensor (OEM #13598771 (supersedes 25799331, 13586335)) — This is the most common fix for an isolated C0750 code, typically due to an expired internal battery after 7-10 years.
  Trusted brands: ACDelco (OEM), Schrader (OEM Supplier), Continental, Dorman
  OEM price range: $60-$90
  Aftermarket price range: $40-$70
• Remote Control Door Lock Receiver (RCDLR) (OEM #20803735 (supersedes multiple previous numbers including 15857831)) — This module is the likely culprit when all TPMS codes set together, especially if accompanied by key fob or starting issues.
  Trusted brands: ACDelco (OEM)
  OEM price range: $70-$150

Related Codes That Often Appear With This One

• C0755 — Right Front TPMS sensor fault. Often appears with C0750 when the RCDLR module is failing.
• C0760 — Left Rear TPMS sensor fault. Often appears with C0750 when the RCDLR module is failing.
• C0765 — Right Rear TPMS sensor fault. Often appears with C0750 when the RCDLR module is failing.
• B3055 — No Transponder Modulation or No Transponder. This security code can be set alongside C0750 due to a central electrical or module issue, as noted in TSB PIC5650M.

Technical Service Bulletins (TSBs) & Recalls

• PIC5650M (and its revisions like PIC5650K): Mentions that C0750 (and other TPMS codes) may be found when diagnosing an intermittent no crank, no start, or start/stall concern with the security light on. It strongly points to Radio Frequency Interference as a possible cause.
• 16-NA-061: Details how a disconnected RCDLR antenna coax cable can cause intermittent TPMS and key fob issues, sometimes only affecting the sensors furthest from the receiver.
• 16-NA-396: Links intermittent key fob, passive entry/start issues, and multiple TPMS codes (including C0750 with symptom byte :29) to an internal failure of the RCDLR module, recommending its replacement.

Platform-Specific Known Issues

• Per TSB #PIC5650M, code C0750 can be found in conjunction with an intermittent no-crank, no-start, or stalling condition where the security light is also on. This points to a complex electrical issue rather than a simple sensor failure.
• A user on TahoeYukonForum.com with an '09 Escalade fixed their non-working TPMS and key fobs by replacing the RCDLR with one from a 2011 Impala from a salvage yard, noting that newer part numbers are often compatible.
• Another user on the same forum traced their RCDLR failure, which presented with TPMS and key fob issues, to broken power wiring in the flexible boot between the driver's door and the body.

Hidden / Shadow Codes Worth Checking

• C0750 00: Indicates a general loss of communication with the left front TPMS sensor. This is the most common variant. (see via GM Tech 2, GDS2, or high-end bidirectional scan tool.)
• C0750 03: Indicates a low voltage condition related to the sensor. This can be a direct indicator of a failing sensor battery. (see via GM Tech 2, GDS2, or high-end bidirectional scan tool.)
• C0750 08: Indicates the signal received from the sensor is invalid or corrupt. This can be caused by RF interference or a failing sensor. (see via GM Tech 2, GDS2, or high-end bidirectional scan tool.)
• C0750 29: Indicates 'Too Few Pulses' were received from the sensor. TSB 16-NA-396 specifically links this symptom byte to an internal RCDLR failure. (see via GM Tech 2, GDS2, or high-end bidirectional scan tool.)

Scan Tool Commands That Help

• GM Tech 2 / GDS2: RCDLR Data Display — Use this to view live data from the RCDLR, including the reported battery status of each TPMS sensor ('OK' or 'Low') and the sensor's current mode (e.g., 'Park' or 'Drive'). This can confirm a low battery before replacing the sensor.
• GM Tech 2: Module Setup > RCDLR — This path is used for setting up a new RCDLR module after replacement. It is required to program the new module to the vehicle's BCM and learn the key fobs and TPMS sensor IDs. The specific path may be under 'Suspension > Tire Pressure Monitoring' or 'Body > Remote Control Door Lock Receiver'.
• GM Tech 2 / GDS2: TPMS Relearn Procedure — After replacing a sensor or the RCDLR, this command initiates the sensor learning process, allowing the vehicle to register the new sensor IDs and their positions. This is a more reliable method than the manual (air release) procedure.

Wiring & Ground Locations

• RCDLR Module — Located in the driver's side rear quarter panel, behind the D-pillar interior trim and often near the speaker.. This is the central receiver for all TPMS sensor signals. Its location makes it susceptible to issues if the rear of the vehicle has had water leaks or trim removal/reinstallation.
• RCDLR Antenna System — A multi-part system consisting of the RCDLR, a coax cable, an antenna amplifier module, and the antenna itself which is integrated into the right rear quarter glass.. Per TSB 16-NA-061, a disconnect at the RCDLR, the amplifier, or the glass can cause signal loss. A disconnect at the amplifier may only cause the furthest sensors (like the Left Front) to drop out intermittently, directly causing an isolated C0750.
• BCM (Body Control Module) — Located to the left of the steering column, often behind the lower dash panel.. The RCDLR sends its data to the BCM, which then communicates with the instrument panel. While less common, issues with the BCM or its wiring/grounding can mimic RCDLR problems.
• Driver Door Jamb Harness — The flexible rubber boot between the driver's door and the A-pillar.. This area experiences constant flexing. A real-world repair confirmed that broken power wiring for the RCDLR can occur within this harness, leading to a dead RCDLR and multiple TPMS codes.

Real Owner Repair Stories

• Tahoe Yukon Forum user (2007-2014 GM SUV (platform equivalent to Escalade)) — TPMS error message on DIC and key fobs not working simultaneously.
  ❌ Tried (didn't work) Replacing the RCDLR module with a new one.
  ✅ What actually fixed it The mechanic found broken wiring in the driver's side door jamb harness that supplied power to the RCDLR. A new power wire was run to the module, and the new module was programmed, which resolved all issues.

OEM Part Supersession History

• 15857831, 25855007, and others → 20803735 — Part has been revised and updated by GM over the years to improve reliability and consolidate inventory.
  Heads up: The newest part number (20803735) is the correct service replacement for all previous versions on this platform. Always requires programming to the vehicle after installation.