P046C on RAM
Exhaust Gas Recirculation Sensor "A" Circuit Range/Performance
P046C on RAM vehicles indicates exhaust gas recirculation sensor "a" circuit range/performance. Au7o has documented this code across 1 RAM model — most commonly on 2500. 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 RAM range from $500 to $1,800, 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 RAM by Model
RAM 2500(1 issue)
- 6.7L Cummins EGR Cooler Clogging and Cracking2007-2024
The EGR cooler routes hot exhaust through a coolant-jacketed heat exchanger before recirculating it into the intake. Heavy soot loading progressively plugs the cooler and EGR valve, first showing as slight off-idle hesitation and rising EGTs, then triggering EGR flow/performance codes and limp mode. Worse, a clogged, thermally stressed cooler can crack internally and leak coolant into the exhaust/intake stream, causing white smoke, coolant loss, and potential hydrolock or catastrophic engine damage. Cummins service intervals call for cleaning the EGR valve/cooler roughly every 67,500 miles (2007.5-2018) or 75,000 miles (2019+), which many owners never perform.
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View P046C across all makes →Frequently Asked Questions
What does P046C mean on RAM?▼
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 RAM specifically, this code is documented across 1 model.
What causes P046C on RAM vehicles?▼
Common causes on RAM: 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 RAM?▼
Repair costs on RAM range from $500 to $1,800, depending on the specific model and root cause.
Which RAM models have P046C documented?▼
Au7o has documented P046C on 1 RAM model: 2500.