Chevy Codes List. Chevy-Enhanced Trouble Code Lookup

Code lookup

Chevy-enhanced powertrain, body, chassis and network codes. Generic P0xxx codes live on OBD Codes List.

Results

Technician notes

What this order covers

Chevy Codes List is a free, no-sign-up lookup for Chevy-enhanced diagnostic trouble codes: the manufacturer-specific powertrain, body, chassis and network codes GM adds on top of the generic standard. The powertrain half is mostly sensor circuits, fuel and ignition, EVAP and emissions controls, electronic throttle and transmissions. The rest is theft deterrent, traction control, body control and network faults.

Each line explains what the code means on Chevrolet, GMC, Buick and Cadillac vehicles, how serious it is, what usually causes it, and a safe order of steps to check and fix it.

How GM codes work

GM runs two layers of diagnostics. Generic P0xxx codes are the SAE standard every automaker shares. The manufacturer-specific layer covers GM-only systems: powertrain faults such as sensor circuits, electronic throttle, ignition and misfire detection, EVAP, theft deterrent, crank variation learn and transmission controls, plus the body, chassis and network faults the generic standard leaves to the maker. This order covers the enhanced layer.

On 1996-and-newer vehicles, pull codes through the DLC under the dash. After crank sensor, PCM, or engine work, run the crank variation learn (see P1336). Skip it and misfire detection reads false. No parts needed, just the relearn.

Standard procedure

Pull the code. Connect an OBD-II scanner and note the Chevy-enhanced codes alongside any generic P0xxx codes.
Look it up. Enter the full code, or a word like “misfire” or “transmission”, in the lookup box at the top of the page.
Check GM patterns. Every line lists the failures these codes show most on Silverado, Sierra, Tahoe, Equinox and other GM vehicles.
Diagnose before you spend. Follow the steps and confirm with live data before replacing parts.

Common concerns, GM

A few patterns cause most GM check-engine lights.

P1811 Maximum Adapt and Long Shift. Worn clutch packs causing long 1-2, 2-3, or 3-4 shift times.
P1860 TCC PWM Solenoid Circuit Electrical. Faulty TCC PWM solenoid valve on the control valve body.
P1175 Fuel Trim Cylinder Balance Bank 2. Clogged or imbalanced Bank 2 fuel injectors.
P1415 Secondary Air Injection System Bank 1. Failed secondary air injection check valve on Bank 1 letting exhaust back into the pump.

Models covered

Every page notes where it applies. Covered: Silverado, Sierra, Tahoe, Yukon, Equinox, Traverse, Malibu, Impala, Colorado, Acadia, Buick Enclave and LaCrosse, Cadillac Escalade, CTS and XT5. Trucks carry extra transmission and transfer-case codes.

Chevy guides

Chevy P1xxx Fuel and Ignition Codes Explained How Chevy P1xxx fuel and ignition codes differ, how GM sets them, and the order to check air leaks, sensor signals, fuel pressure, and parts.
GM Security Codes and the Passlock Relearn The GM theft deterrent codes, the Passlock, Passkey and immobilizer families, the 10 and 30 minute relearn cycles, and the mistakes that cause another lockout.
GM ABS and Stabilitrak Codes Explained How GM ABS, traction and Stabilitrak codes connect, why one sensor or a weak battery sets several, and the order to check wheel speed, power, grounds and modules.