Honda-Enhanced Trouble Code Lookup

Search 278 Honda-enhanced codes for what they mean, what causes them, and how to fix them, led by ignition and fuel metering and the hybrid network. For generic P0xxx codes, see OBD Codes List.

How to read a Honda code

Pull the code. Connect an OBD-II scanner and note the Honda-enhanced codes alongside any generic P0xxx codes.
Look it up. Enter the full code or a keyword like “VTEC” or “air fuel” in the search box above.
Check Honda patterns. Every page lists the failures these codes show most on Civic, Accord, CR-V, Odyssey and other Honda vehicles.
Diagnose before you spend. Follow the step-by-step guidance and confirm with live data before replacing parts.

What is Honda OBD Codes?

Honda OBD Codes is a free, no-sign-up lookup for the maker-specific codes a Honda or Acura sets on top of the generic standard. Ignition and fuel metering lead here, alongside the powertrain control module and an unusually large block of network and communications codes that carry the IMA hybrid and CAN bus faults. Each page says what the code means, how serious it is, what usually causes it, and the order to check it.

How Honda trouble codes work

Honda runs the shared SAE codes plus its own. What makes this maker layer unusual is its size in two places: ignition and fuel metering, and network and communications, where the IMA hybrid system and the CAN bus raise codes a generic reader will not explain. Generic P0xxx codes live on OBD Codes List.

On 1996-and-newer Honda and Acura vehicles, pull codes with an OBD-II scanner through the DLC under the dash. Older Hondas flash codes if you jump the blue two-pin SCS connector. Know this: VTEC and VTC run on engine oil pressure. Low, dirty, or wrong-viscosity oil sets timing codes like P1009 with nothing electrically wrong. Check the dipstick before the wiring diagram.

Failures Honda owners see most

A few patterns cause most Honda check-engine lights. P1279 means the VTEC system is malfunctioning. Oil-related first, solenoid second. P1297 flags the electrical load detector reading low. It confuses idle control and charging on Civics and Accords. P1509 means the idle air control valve circuit failed. Hunting or stalling idle. P1498 flags the EGR valve lift sensor reading high. And P1157 means the bank 1 air/fuel sensor circuit is malfunctioning, upstream of the converter.

Models covered

Every page notes where it applies. Covered: Civic, Accord, CR-V, Odyssey, Pilot, Ridgeline, Insight, Fit, Acura TL, MDX and RDX. IMA hybrids carry extra motor-assist codes.

Honda guides

Honda VTC and VTEC Codes Explained. What Honda VTC and VTEC codes mean, why oil condition and oil pressure cause most of them, and the order to check before buying parts.
Honda Misfire Codes and What Causes Them. What Honda misfire codes mean, why plugs, coils, valve clearance and EGR carbon cause them, and when a flashing check engine light means stop.
Honda ABS and VSA Warning Lights Explained. How Honda ABS and VSA warning lights work together, what the codes mean, the order to check wheel speed sensors, and when it is safe to drive.