OBD-II Diagnostic Trouble Code
P0183 — Fuel Temperature Sensor A Circuit High
P0183 means the fuel temperature sensor A signal voltage is above the ECM's maximum. With a thermistor this usually reads as an extremely cold fuel temperature. It normally means an open circuit, an unplugged connector or a signal wire shorted to voltage.
Severity 2/5
Truck-relevant
Service soon
Severity
Service soon
Fuel Temperature Sensor A Circuit High
Code
P0183
Category
Powertrain
Subsystem
Fuel
Truck-relevant
Yes
What this means for truckers
Service this week on a Cummins X15, Detroit DD15, PACCAR MX-13. Not an immediate stop, but ignoring it usually leads to a more expensive fix downstream.
Before you replace parts — try this first
P0183 on the Fuel system is most often unplugged, loose or corroded connector — not a dead part. On commercial diesels especially, work these in order before spending money on parts:
- Confirm the symptoms. Match what your truck is doing to the Symptoms section below. If the code is set but the symptoms are not there, clear the code and re-test after a drive cycle — it may not return.
- Clean and dry the sensor connector. Water, road salt, or oil seeping into a connector is the #1 fake sensor failure. Disconnect, look for green corrosion or moisture, spray with electrical contact cleaner, dry, reseat. Many faults clear here for $0.
- Inspect the wiring harness. Trace the wire from the sensor toward the ECM — look for chafing against the engine block, melted insulation near the turbo or exhaust, or pinch points where a clamp has rubbed through.
- Test the sensor before swapping it. Most Common Causes (below) list the expected voltage or resistance range — a $20 multimeter saves a $300 sensor swap that does not fix the problem.
- Only then, replace the part. Use the OEM or a tier-1 aftermarket. Cheap sensors throw the same code in two weeks.
Symptoms
Check-engine light is on. The scan tool shows a fuel temperature stuck at a cold extreme. On diesels the ECM uses a default value, and you may notice slightly rougher running, a little more smoke or a mild power change. Many trucks drive normally.
Common causes
- CommonUnplugged, loose or corroded connector ($50–$200)
- CommonOpen signal or ground wire ($100–$350)
- CommonOpen circuit inside the fuel temperature sensor ($80–$300)
- RareSignal wire shorted to a voltage source ($100–$350)
How to fix
With a fused jumper, connect the signal terminal to the sensor ground terminal at the harness connector. If the reading swings to the hot extreme, the wiring is good and the sensor is open.
When to use: First test
Check signal and ground continuity back to the ECM.
When to use: When the jumper test shows no change
Replace the sensor or repair the wiring.
When to use: Based on the test results
Affects most
No specific vehicle pattern found in our complaint database. This code can appear on any vehicle that supports OBD-II diagnostics.
Related
- → Browse all DTC trouble codes
- → Decode a VIN to check codes for your truck
- → Owner-operator maintenance guides
- → P0100 — Mass or Volume Air Flow Circuit
- → P0101 — Mass or Volume Air Flow Circuit Range/Performance
- → P0102 — Mass or Volume Air Flow Circuit Low Input
- → P0103 — Mass or Volume Air Flow Circuit High Input
- → P0104 — Mass or Volume Air Flow Circuit Intermittent
Frequently Asked Questions
Can I drive with code P0183?
P0183 is severity 2 — service this week. Not an immediate stop, but ignoring it usually compounds the problem. Most common cause for this code is a worn sensor or minor performance fault that won't strand you today but will get more expensive the longer you wait.
How much does it cost to fix P0183 on a commercial truck?
Total repair cost ranges $50–$350 depending on the root cause. The cheapest fix is usually the first one listed below — Unplugged, loose or corroded connector — which is also the most common. On commercial trucks the cost is usually higher than passenger vehicles due to part availability and shop labor rates ($120–185/hour at most truck shops, vs $90–130 at general auto shops). DIY-capable fixes (sensors, hoses, filters) are at the low end; major component replacements (turbo actuator, high-pressure fuel pump, transmission solenoid pack) are at the high end. Always diagnose with a scan tool BEFORE replacing parts — guessing wrong on a $1,500 turbo actuator when the actual issue was a $30 boost hose is a common expensive mistake.
Will P0183 fail a DOT inspection?
P0183 itself doesn't automatically fail an inspection, but if the truck is in reduced-power mode (limp mode) at the time of inspection, it WILL be flagged. Most inspectors will note the check engine light but pass the truck if it's running and performance is normal. Fix it before a Level 1 inspection regardless.
What's the difference between P0183 and related codes?
P0183 is closely related to: P0100 (Mass or Volume Air Flow Circuit), P0101 (Mass or Volume Air Flow Circuit Range/Performance), P0102 (Mass or Volume Air Flow Circuit Low Input), P0103 (Mass or Volume Air Flow Circuit High Input). These codes share the same subsystem (fuel) and often appear together. If you see this code, scan for the full code list — fixing the root cause usually clears multiple companion codes at once. If only P0183 is set without the companions, the issue is more isolated.
How do I prevent P0183 from coming back after a repair?
For P0183 (Fuel Temperature Sensor A Circuit High), prevention centers on the fuel system. Replace fuel filters at the OEM interval — don't stretch them. Use only diesel from high-volume fuel stops (avoid bottom-of-tank fuel at low-traffic stations). Add a water separator if you don't have one. After repair, prime the fuel system per the engine manual.