C0711: Level Control Air Pressure Sensor Malfunction - Signal Invalid
2 vehicles · 1 makes
Most Reported On
C0711 is an OBD-II diagnostic trouble code meaning “Level Control Air Pressure Sensor Malfunction - Signal Invalid.” A GM chassis code found on trucks and SUVs with Autoride / automatic level control air suspension (Tahoe, Suburban, Yukon, Escalade and similar). The electronic suspension control module reads an air pressure sensor that reports air-spring system pressure, and this code sets when that signal is outside the valid voltage window. The result is a "Service Suspension System" warning and loss of automatic rear leveling, so the vehicle may sag when loaded. Inspect the wiring at the air compressor before replacing parts - a damaged or pinched harness there is the most common and cheapest cause. This code is most commonly reported on 2003-2006 Cadillac Escalade ESV, and 2007-2014 Cadillac Escalade.
Common Causes
Diagnostic Tools
This is a chassis code. A basic engine-code reader will not show it — you need a scanner that reads chassis modules. These read C0711.
One caveat that applies to every scanner: only powertrain codes are standardised across manufacturers. Body, chassis and network coverage is "enhanced" diagnostics, and how deep it goes varies by make and model year — check your specific vehicle against the tool's coverage list before buying.
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (2)
FAQ
What does C0711 mean?
C0711 stands for "Level Control Air Pressure Sensor Malfunction - Signal Invalid." A GM chassis code found on trucks and SUVs with Autoride / automatic level control air suspension (Tahoe, Suburban, Yukon, Escalade and similar). The electronic suspension control module reads an air pressure sensor that reports air-spring system pressure, and this code sets when that signal is outside the valid voltage window. The result is a "Service Suspension System" warning and loss of automatic rear leveling, so the vehicle may sag when loaded. Inspect the wiring at the air compressor before replacing parts - a damaged or pinched harness there is the most common and cheapest cause.
What are the most common causes of C0711?
The most common causes of C0711 are: Chafed or pinched wiring at the air compressor harness, Failed air pressure sensor in the level control system, Corroded or loose connector at the compressor/sensor, Air leak in the air springs or lines producing an out-of-range pressure, Failed air compressor assembly, Failed electronic suspension control module. The specific cause varies by vehicle.
How much does it cost to fix C0711?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by C0711?
Au7o has documented C0711 across 2 vehicle models from 1 manufacturers: Cadillac.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.