Common Ford F-150 Fault Codes

The Ford F-150 is the best-selling vehicle in North America, so its diagnostic trouble codes are among the most-searched of any truck — and because so much of the F-150's hardware (turbocharged EcoBoost engines, the vacuum-actuated 4WD front hubs, power running boards, an integrated trailer-brake controller) is Ford-specific, a lot of its codes are manufacturer codes a basic reader can't fully decode. This guide groups the most common F-150 trouble codes by system, explains what each one means, and points you to where a generic OBD-II reader stops and a Ford-capable scan tool is needed.

Which F-150 do you have? Behaviour varies a lot by generation and engine, so match a code to your truck: 12th gen (2009–2014), 13th gen (2015–2020, aluminium body), and 14th gen (2021+, which adds the 3.5L PowerBoost full hybrid and its high-voltage system; the all-electric Lightning is a separate EV model). Engines span the 3.7L and 3.3L Ti-VCT V6, the 5.0L "Coyote" V8, the 6.2L V8, the 2.7L and twin-turbo 3.5L EcoBoost V6, and the 3.0L Power Stroke diesel. Transmissions are the 6R80 6-speed (through the mid-2010s) and the 10R80 10-speed (phased in from 2017). A code that is normal on one engine or year may not exist on another.

How Ford F-150 fault codes are structured

The F-150 uses the standard SAE OBD-II categories — P (powertrain), B (body), C (chassis), and U (network) — but many of its faults are manufacturer-specific codes stored in individual modules (ABS, BCM, restraints, running-board, trailer-brake) that a basic code reader either can't see or can't fully decode. Ford's dealer software (IDS/FDRS) and capable aftermarket scanners read every module and expose sub-type ("fault-type byte") detail, freeze-frame data, and the bidirectional tests many F-150 repairs require. Many F-150 codes carry a two-character suffix (for example the "-11" or "-00" you'll see on the pages below) — that byte describes the exact failure mode (short to ground, circuit open, no sub-type information, and so on).

One theme worth knowing up front: a weak battery or charging system sits behind a surprising number of F-150 "electrical" faults. Low system voltage can trip body and network codes together that look unrelated, so when several modules report faults at once it's worth checking power and grounds first — see why low voltage causes multiple DTC codes and how to find the root-cause code.

Powertrain codes (engine & transmission)

Powertrain P-codes are the ones a generic OBD-II reader will usually catch. The most common on the F-150:

• P0300 — random/multiple misfire, with cylinder-specific codes P0301–P0306 (V6) or P0301–P0308 (V8). On the 3.5L EcoBoost a classic cause is condensation collecting in the intercooler, which the engine then gulps under hard acceleration in humid or cold conditions — a stumble and misfire that clears once things dry out. Coils, spark plugs (EcoBoost plugs wear early), and — on the earlier 2011–2016 direct-injection-only 3.5L — carbon build-up on the intake valves are the other usual suspects. Without a scanner, see how to find a misfiring cylinder without a scanner; with one, use scan-tool misfire diagnosis.
• P0171 / P0174 — system too lean, banks 1 and 2. Common on higher-mileage F-150s from intake or PCV air leaks, a dirty MAF, or (on the EcoBoost) a leaking charge-air system. Read the fuel trims to confirm before parts — see fuel-trim diagnostics.
• P0299 — turbocharger underboost, an EcoBoost-specific code usually pointing to a boost leak (intercooler pipe/clamp), a sticking wastegate, or the charge-air plumbing rather than a failed turbo.
• P0016 — crankshaft/camshaft correlation, bank 1. This is closely tied to the well-known Ford cam-phaser rattle on cold start — most notoriously on the 3.5L EcoBoost, though the 5.0L Coyote also has VCT/phaser complaints — with correlation or VCT codes such as P000A (bank 1 intake camshaft slow response) and P0345 (camshaft position sensor, bank 2). See VVT and cam/crank correlation and crank & cam sensor testing.
• P0420 / P0430 — catalyst efficiency below threshold, banks 1 and 2. Confirm with the downstream O2 data before condemning a converter — P0420 diagnosis.
• P0128 — coolant below thermostat regulating temperature; a stuck-open thermostat is the usual cause (P0128 guide).
• P0562 / P0563 — system voltage low / high. Often the first domino in a charging-system or battery problem that then trips body and network codes.
• P0234 — turbocharger overboost (EcoBoost), typically a wastegate or boost-control fault.

Transmission faults on the 6R80 and 10R80 show up as:

• P0700 — a general "transmission control system" flag telling you the TCM has stored its own code; read the TCM for the specific fault before diagnosing.
• P0715 — input/turbine shaft speed sensor circuit, and P0720 — output shaft speed sensor circuit. Both feed the TCM the ratio data it uses to control shifts; start with fluid level and condition and the sensor circuits (automatic transmission code diagnosis). The 10R80 in particular is sensitive to fluid condition.

4WD, IWE & transfer-case codes

This is the most F-150-specific group. On many 4x4 F-150s (through the 13th generation) the front axle uses Integrated Wheel Ends (IWE) — vacuum-actuated locking hubs that connect the front wheels only when 4WD is engaged. (Newer trucks moved to an electric front-axle disconnect, so the vacuum codes below apply to the vacuum-IWE years.) When a check valve, hose, or the IWE solenoid leaks, the hubs partially engage and you get a distinctive grinding or clicking from the front end, especially on light throttle or when shifting into 4WD:

• C1979 — IWE solenoid circuit failure. Alongside it you'll often see the vacuum-sensor codes C109D (low vacuum detected), C109E, and C109F (vacuum sensor circuit/signal). A leaking IWE system is one of the most common — and most misunderstood — F-150 front-end complaints.
• C1728 / C1729 — electronic transfer case unable to transition between 4H and 4L. Check the shift-motor, its encoder, and battery voltage before condemning the transfer-case control module.
• U0114 / U0414 — lost communication with / invalid data from the four-wheel-drive clutch control module (network side of the same driveline system).

Chassis, ABS, steering & trailer-brake codes

Chassis C-codes are read through the ABS/stability module and the trailer-brake and TPMS modules, not the engine ECU, so a generic reader usually can't see them:

• Wheel-speed faults are common on higher-mileage trucks: C1155 (left front), C1165 (right rear), C1175 (left rear). Test the sensors and inspect the tone rings per wheel-speed sensor testing.
• C1300 — ABS pump-motor circuit failure, and stability-system sensor faults such as C1145 (yaw-rate sensor) and C1280 (yaw-rate signal). A stored steering-angle reference can also drop out after alignment work or a battery disconnect — background in steering-angle sensor calibration.
• C2806 / C2807 — integrated trailer-brake controller wiring, short to battery / short to ground. Genuinely F-150-specific and a frequent complaint on trucks used for towing; inspect the 7-pin harness and the brake-controller connector.
• C1A56 / C1A58 — TPMS sensor "not programmed" (left/right front). Common after tyre or sensor replacement — the new sensor IDs need to be relearned to the truck.
• C1D00 — park-brake apply-switch circuit (electronic parking brake, later trucks).

Body & convenience codes

F-150 B-codes split into genuine circuit faults you can diagnose and historical records you should not chase:

• B1163 and the surrounding B116x range — power (deployable) running-board motor and Hall-effect sensor faults. Well-equipped SuperCrews with power boards throw these when a board sticks, the motor draws high current, or a Hall sensor fails.
• B1317 / B1318 — battery voltage high / low, reported by the body control module. Treat these as a charging-system prompt, not a body-module failure.
• B1676 — "crash recorded / driver restraint system." This is a historical deployment record, not a live circuit to chase; it appears on trucks with airbag history and generally needs the restraints control module addressed properly (diagnosing SRS airbag faults — always work with the battery disconnected and follow SRS precautions).

Network (U) codes and lost communication

U-codes mean one module has stopped hearing another over the CAN network. On the F-150 they frequently accompany a low-voltage condition or a connector/ground fault rather than a truly dead module:

• U0100 (lost comms with the ECM/PCM), U0140 (body control module), U0121 (ABS module), and U0155 (instrument cluster) are the common "lost communication" codes.
• U0131 — lost communication with the power-steering control module (relevant on electric-assist steering).
• U0452 — invalid data from the restraints control module.
• U0073 (control-module communication bus A off) and U1900 (CAN bus receive error) point at the bus itself — diagnose the wiring, power/ground, and termination with CAN bus fault diagnosis and the 60-ohm rule before condemning a module.

When you need a Ford-capable scan tool

A basic reader will pull generic powertrain P-codes, but most of the F-150's body, chassis, 4WD, and network faults live in modules a generic tool can't reach — and many repairs (relearns, calibrations, bidirectional actuations) need dealer-level access. For those you'll want Ford's IDS/FDRS or an aftermarket scanner with full Ford coverage. One catch on newer trucks: many recent Fords sit behind a Security Gateway Module that blocks unauthenticated tools from clearing codes or running bidirectional tests until the tool authenticates — reading codes still works, but clearing and actuation can be locked without a supported tool. For the general workflow of turning a code into a confirmed fault, see why you should stop replacing parts without testing.

FAQ

What is the most common fault code on a Ford F-150? Misfire codes (P0300 and cylinder-specific P030x) are among the most frequent, especially on the 3.5L EcoBoost, followed by lean codes (P0171/P0174), the P0700 transmission flag, and — on 4x4 trucks — the IWE/vacuum front-end codes and a range of body and network codes tied to battery/charging health.

Why does my F-150 grind or click from the front end in 4WD? On 4x4 F-150s that's typically the Integrated Wheel End (IWE) system: a vacuum leak or a failing IWE solenoid lets the front hubs partially engage. It often sets C1979 and vacuum-sensor codes (C109D). Check the vacuum lines, the check valve, and the solenoid before the hubs themselves.

Can I read F-150 codes with a cheap OBD2 scanner? A cheap reader will show generic engine (P) codes, but most B, C, and U codes — running boards, ABS, trailer brake, 4WD, restraints, network — need a Ford-capable tool (IDS/FDRS or an aftermarket scanner with full Ford coverage) to read and to run the relearns and tests repairs require.

Several unrelated electrical codes appeared at once — what causes that? On the F-150 a weak battery or charging system can trip multiple modules together (you'll often see B1318/P0562 alongside U-codes). Check power, grounds, and the battery before replacing anything — see the low-voltage cascade effect.