Honda fault codes

16 distinct codes across 11 real diagnostics on Honda, including the Honda-specific ones no generic code list can decode.

Honda-specific codes

These are manufacturer-specific, which means the same code on another marque is a different fault. That is exactly why they have no page of their own and no entry in any generic code list. Scoped to Honda and ranked by how often we have actually seen them, they are a claim we can stand behind.

• P1435, seen in 1 Honda diagnostic
• P19FF, seen in 1 Honda diagnostic

Standard codes we see most on Honda

These are standardised, so they mean the same thing on every vehicle. The counts are what we see on Honda specifically.

• P0302, Cylinder 2 misfire detected
• P0303, Cylinder 3 misfire detected
• P0325, Knock sensor 1 circuit, bank 1
• U0401, Invalid data received from ECM/PCM A
• P0118, Engine coolant temperature circuit high
• P0157, O2 sensor circuit low voltage, bank 2 sensor 2
• P0300, Random or multiple cylinder misfire detected
• P0301, Cylinder 1 misfire detected
• P0304, Cylinder 4 misfire detected
• P0305, Cylinder 5 misfire detected
• P0306, Cylinder 6 misfire detected
• P0685, ECM/PCM power relay control circuit open
• P0810, Clutch position control error
• P2647, A rocker arm actuator system performance or stuck off, bank 1

What tends to go wrong on Honda

By share of the codes we have seen on this marque. A description of our own caseload, not a reliability ranking.

• Misfire, 9 code sightings
• Ignition and knock sensing, 2 code sightings
• Powertrain, manufacturer-specific, 2 code sightings
• Bus communication, 2 code sightings
• Cooling and thermostat, 1 code sighting
• Glow plugs and preheat, 1 code sighting