C0755 on 2007-2013 Cadillac Escalade EXT: Left Rear TPMS Fault Causes and Fixes

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

On the GMT900 platform, which includes the 2007-2013 Escalade EXT, the TPMS sensors communicate with the Remote Control Door Lock Receiver (RCDLR), which also handles key fob functions. This module, often located in the headliner or near the rear of the cab, relays the information to the Body Control Module (BCM). While typically a straightforward TPMS issue, a manufacturer bulletin (PIC5650M) has linked this code, along with others, to rare but complex electrical problems that can result in a no-start condition, suggesting diagnostics should not be taken lightly if other symptoms are present. In some cases, the RCDLR itself can enter a 'sleep' mode, causing both TPMS and key fob issues, which can sometimes be temporarily resolved by pulling and reinstalling its fuse.

Diagnostic Flowchart

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

Symptoms You May Notice

• Flashing, then solid TPMS warning light on the instrument cluster.
• "Service Tire Monitor System" message on the Driver Information Center (DIC).
• The pressure reading for the left rear tire shows as dashes (--) on the DIC.
• Key fob may have reduced range or be inoperative if the RCDLR module is the root cause.

Most Likely Causes

1. Dead TPMS Sensor Battery 🔴 High Probability → Shop Tire Pressure Monitoring System (TPMS) Sensor The non-replaceable batteries inside TPMS sensors have a finite lifespan, typically 7-10 years. Vehicles in this 2007-2013 year range are at or beyond the expected life of the original sensors, making battery failure the most common cause.
   How to confirm: Use a TPMS diagnostic tool to attempt to activate the sensor. If the tool cannot get a response (no reading for pressure, temperature, or battery status), the sensor has failed. A professional scan tool may also explicitly show a 'low battery' status for the sensor in the RCDLR data.
   Typical fix: Replace the left rear TPMS sensor and perform the TPMS relearn procedure. It is often recommended to replace all four sensors at the same time if they are original, as the others are likely to fail soon.
   Est. part cost: $40 - $150
2. Faulty TPMS Sensor 🟡 Medium Probability → Shop Tire Pressure Monitoring System (TPMS) Sensor Sensors can be damaged during tire changes or fail internally from vibration, corrosion, and age.
   How to confirm: The sensor will fail to respond to a TPMS activation tool, even if the battery isn't the primary issue. The diagnostic code C0755 points directly to a sensor-specific fault, which a scan tool might specify as an 'Internal Malfunction'.
   Typical fix: Replace the left rear TPMS sensor and perform the TPMS relearn procedure.
   Est. part cost: $40 - $150

Rare But Worth Checking

• Faulty Remote Control Door Lock Receiver (RCDLR): → Shop Keyless Entry Receiver The RCDLR is the receiver for the TPMS signals on this platform. If multiple TPMS sensor codes are present (e.g., C0750, C0760, C0765) or if key fob functions are also problematic, the RCDLR could be the issue. TSBs mention it can go into a 'sleep' state, be resolved by a fuse pull, or have a poor antenna connection.
• Radio Frequency (RF) Interference: Aftermarket electronics like cheap phone chargers, USB power banks, aftermarket LED lights, and dash cams can sometimes interfere with the 315MHz signal from the TPMS sensor, preventing the RCDLR from receiving it. TSB PIC5650K specifically calls out these devices as potential causes for TPMS and other RF-related issues.
• Body Control Module (BCM) Issue: → Shop Body Control Module As a last resort, if the sensor and RCDLR are confirmed good, the BCM which processes the data could be at fault. This is very uncommon.
• Incorrectly Learned Sensor Positions: If tires were recently rotated without performing the relearn procedure, the system may report a fault for the left rear, when the problematic sensor is actually at a different corner of the vehicle. Always perform the relearn procedure after tire rotation.

Diagnosis Steps

1. Verify tire pressures manually with a reliable gauge to rule out an actual low-pressure situation.
2. Use a professional scan tool to read the BCM/RCDLR and confirm C0755 is the active code. Check for any sub-codes or low battery indicators.
3. Temporarily unplug all aftermarket 12V accessories (phone chargers, dash cams, etc.) to eliminate potential Radio Frequency (RF) interference.
4. Use a TPMS activation tool at the left rear wheel to attempt to read the sensor's pressure, temperature, and battery status.
5. If the tool gets no response, the sensor is bad and needs replacement.
6. If the tool reads the sensor, but the code persists, attempt a TPMS relearn procedure. This can be done via the DIC (often by holding lock/unlock on the key fob to enter learn mode) and then letting air out of each tire in sequence (LF, RF, RR, LR) until the horn chirps for each.
7. If the relearn procedure fails repeatedly for the left rear sensor, suspect a faulty new sensor or an issue with the RCDLR or its antenna connection.
8. If multiple TPMS codes are present and/or key fob issues exist, investigate the RCDLR. Check its fuse (labeled 'DSM' in the instrument panel fuse box) and inspect the antenna coax cable for secure connections.

Parts You'll Likely Need

• Tire Pressure Monitoring System (TPMS) Sensor (OEM #13586335) — This is the component that fails most often, usually due to its internal battery expiring after 7-10 years. It is the direct cause of the C0755 code. This part number may be superseded by 13598771, 13516164, or 13540600.
  Trusted brands: ACDelco (OEM), Schrader (Often the OEM manufacturer), Dorman, CDWTPS
  OEM price range: $80-$150
  Aftermarket price range: $40-$80

Related Codes That Often Appear With This One

• C0750 — Relates to the Left Front TPMS sensor. Seeing multiple sensor codes can point towards a systemic issue like a faulty RCDLR or widespread sensor age failure.
• C0760 — Relates to the Right Front TPMS sensor. Seeing multiple sensor codes can indicate a larger system problem or a faulty RCDLR.
• C0765 — Relates to the Right Rear TPMS sensor. Seeing multiple sensor codes can indicate a larger system problem or a faulty RCDLR.
• B3055, B3060, B3935 — As cited in TSB #PIC5650M/K, these body and security codes may appear with C0755 in rare cases of a no-start or stalling condition, pointing to a complex electrical fault caused by RF interference or module issues.

Technical Service Bulletins (TSBs) & Recalls

• PIC5650M / PIC5650K: Mentions that DTC C0755 may be found with other codes like B3055 and B3060 in relation to a no crank, no start, or stall concern, often caused by RF interference from aftermarket accessories.
• 16-NA-061 / PIT5446: Details how TPMS codes including C0755, along with key fob issues, can be caused by a disconnected coaxial antenna cable for the RCDLR module.
• PIC3764J: Discusses the RCDLR module going into a 'sleep' state and not waking up, causing TPMS and RKE inoperability, which can be temporarily fixed by pulling and reinstalling the fuse.

Platform-Specific Known Issues

• TSB #PIC5650M (and its revisions like PIC5650K) notes that code C0755 can be found alongside various security-related codes in a rare fault pattern that causes a no-crank, no-start, or stalling condition. This is often traced to RF interference from aftermarket devices like phone chargers or LED lights.
• TSB #16-NA-061 describes how a poor or disconnected RCDLR antenna connection can cause C0755 and other TPMS codes, along with poor key fob range. The bulletin advises checking the coax connections at the RCDLR, antenna amplifier, and the antenna itself (in the rear glass) before replacing modules.

Mechanic-Grade Diagnostic Values

• RCDLR Module Power Supply — expected: +12VDC at the Red/White wire. Failure: No or low voltage indicates a problem with the 'DSM' fuse (10A) in the instrument panel fuse box or the wiring.
• RCDLR Module Ground — expected: Good continuity to chassis ground at the Black/White wire.. Failure: High resistance or an open circuit points to a bad ground connection at G302.

Hidden / Shadow Codes Worth Checking

• C0755 with symptom byte: GM uses 2-digit symptom bytes to specify the exact nature of the fault. Common examples include '00' (Sensor Transmissions Not Received), '08' (Signal Invalid), or '39' (Sensor Low Battery Condition). This provides a much more precise diagnosis than the base code alone. (see via A dealer-level scan tool like a GM Tech 2, GDS2, or a high-end professional scanner capable of reading manufacturer-specific data is required.)

Scan Tool Commands That Help

• GDS2 / Tech 2: Module Diagnostics > RCDLR > Configuration/Reset Functions > Add/Replace Key Fobs — This function is necessary when replacing the RCDLR module to program the existing or new key fobs to the new module.
• GDS2 / Tech 2: RCDLR Setup / Paste TPM Information — When replacing the RCDLR, this service function allows a technician to copy the tire sensor IDs from the old module and write them to the new one, avoiding the need to perform a full TPMS relearn procedure. This must be done BEFORE removing the old module.
• TPMS Activation Tool: Sensor Activation/Trigger — Used at each wheel to force a sensor to transmit its data (ID, pressure, temp, battery status). This confirms if a sensor is dead or if the problem is with the receiver (RCDLR). It's also used during the manual relearn process.

Wiring & Ground Locations

• RCDLR (Remote Control Door Lock Receiver) — On the GMT900 SUV platform, the RCDLR is typically located in the headliner, near the rear of the cab, or above the headliner between the front and rear seats.. This module is the direct receiver for all TPMS sensor signals. A failure, poor connection, or loss of power/ground to this module will cause TPMS codes for one or all wheels.
• G302 / G304 — G302 is located under the right side passenger seat area, often behind trim panels on the B-pillar. G304 is on the right side B-pillar behind the trim panel. A forum post for a 2009 Escalade specifies G302 is on the front door sill under the seat on the passenger side.. A corroded or loose ground at this location can cause intermittent or total failure of the RCDLR module, leading to TPMS codes and key fob issues.
• RCDLR Antenna Coax Cable — Runs from the RCDLR module to an antenna amplifier, and then to the antenna which is often integrated into the right rear quarter glass.. TSB #16-NA-061 specifically notes that this coax cable can become disconnected at the RCDLR, the amplifier, or the glass, causing C0755 and other TPMS codes. A disconnect at the amplifier may only affect the farthest sensors (like the left rear), perfectly mimicking a single failed sensor.

Real Owner Repair Stories

• Tahoe Yukon Forum user 'cnc-97' (2009 Cadillac Escalade ESV (Limousine Conversion)) — TPMS system inoperative (dashes for pressures) and keyless entry not working.
  ❌ Tried (didn't work) Pulling the 10-amp 'DSM' fuse in the fuse box., Unplugging and reinstalling the original RCDLR module.
  ✅ What actually fixed it Replaced the original RCDLR module with a used one from a 2011 Impala sourced from a salvage yard for $5.00. After installing the replacement module, the TPMS system began reporting pressures and the key fobs could be programmed successfully.

OEM Part Supersession History

• 13586335 → 13598771, 13516164, 13540600, 23445327, among others. — Standard part evolution and consolidation by GM.
  Heads up: While many aftermarket sensors are 'pre-programmed', they still require an activation/relearn procedure. Using a sensor with the wrong frequency (e.g., 433MHz for a European model) will not work on a North American vehicle that requires 315MHz.
• 15857831 (RCDLR Module) → Part numbers starting with 2038xxxx or 25xxxxxx are noted as newer, compatible replacements. — Module updates and revisions.
  Heads up: A forum user confirmed a used RCDLR from a 2011 Impala worked in a 2009 Escalade, suggesting some cross-platform compatibility exists for these modules within the same era. However, replacing the RCDLR requires programming with a scan tool.

Model Year Variations Within This Range

• 2007-2013 (GMT900) vs 2004-2006 (GMT800): The 2007-2013 GMT900 platform uses a different 315MHz sensor (e.g., PN 13586335) that communicates with the RCDLR. The earlier 2004-2006 GMT800 platform used a different sensor (e.g., PN 15114379) that communicated with the Passenger Door Module (PDM) on some models. The parts and diagnostic approach are not interchangeable.