P046C on Ford
Exhaust Gas Recirculation Sensor "A" Circuit Range/Performance
P046C on Ford vehicles indicates exhaust gas recirculation sensor "a" circuit range/performance. Au7o has documented this code across 1 Ford model — most commonly on F-350. This code means the engine computer found that the signal from the exhaust gas recirculation (EGR) position/flow sensor is out of its expected range or not changing the way it should compared with commands. The EGR system routes a measured amount of exhaust back into the intake to lower combustion temperatures and reduce emissions, and this sensor reports how far the valve is open or how much gas is flowing. An implausible reading suggests the sensor, the valve it monitors, or the wiring is not performing correctly, which can affect emissions and sometimes idle quality. Typical repair costs on Ford range from $1,500 to $3,500, depending on the specific model and root cause.
Common Causes of P046C
- •Faulty EGR position or flow sensor
- •Carbon buildup clogging the EGR valve or passages
- •Sticking or failing EGR valve
- •Damaged, corroded, or loose sensor wiring/connector
- •Bent or pushed-out connector terminals
- •Vacuum or exhaust leak affecting EGR flow
- •PCM fault (rare)
P046C on Ford by Model
Ford F-350(1 issue)
- 6.7L Power Stroke EGR Cooler Cracking and Coolant Loss2011-2016
The 2011-2016 F-350's 6.7L Power Stroke uses a dual EGR cooling arrangement - a primary cooler plus a secondary cooler section - and both are subjected to thermal cycling between roughly 1,200 F exhaust gas and 200 F coolant. Repeated expansion and contraction fatigues the cooler cores and they crack internally, letting coolant into the exhaust stream. Owners see gradual coolant loss with no external leak, white sweet-smelling smoke (most obvious on a warm restart or under acceleration), and eventually overheating. Trucks that idle for long periods or tow heavy - the typical F-350 dually or chassis cab duty cycle - fail earliest. A common repeat-failure trap is replacing only the primary cooler and leaving the second cooler in place, which sends the truck back in within tens of thousands of miles.
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View P046C across all makes →Frequently Asked Questions
What does P046C mean on Ford?▼
P046C stands for "Exhaust Gas Recirculation Sensor "A" Circuit Range/Performance." This code means the engine computer found that the signal from the exhaust gas recirculation (EGR) position/flow sensor is out of its expected range or not changing the way it should compared with commands. The EGR system routes a measured amount of exhaust back into the intake to lower combustion temperatures and reduce emissions, and this sensor reports how far the valve is open or how much gas is flowing. An implausible reading suggests the sensor, the valve it monitors, or the wiring is not performing correctly, which can affect emissions and sometimes idle quality. On Ford specifically, this code is documented across 1 model.
What causes P046C on Ford vehicles?▼
Common causes on Ford: Faulty EGR position or flow sensor, Carbon buildup clogging the EGR valve or passages, Sticking or failing EGR valve, Damaged, corroded, or loose sensor wiring/connector, Bent or pushed-out connector terminals. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P046C on a Ford?▼
Repair costs on Ford range from $1,500 to $3,500, depending on the specific model and root cause.
Which Ford models have P046C documented?▼
Au7o has documented P046C on 1 Ford model: F-350.