OBD-II Diagnostic Trouble Code
P0224 — Throttle/Pedal Position Sensor B Circuit Intermittent
P0224 means the ECM detected an intermittent signal on pedal or throttle position sensor B, such as brief dropouts or spikes. The circuit is usually loose or worn rather than completely failed. It often accompanies driveability complaints that come and go.
Severity 3/5
Truck-relevant
Service this week
Severity
Service this week
Throttle/Pedal Position Sensor B Circuit Intermittent
Code
P0224
Category
Powertrain
Subsystem
Throttle
Truck-relevant
Yes
What this means for truckers
Service within a few days on a Cummins X15, Detroit DD15, PACCAR MX-13. Performance is likely degraded. Continuing to drive without service risks additional component damage.
Before you replace parts — try this first
P0224 on the Throttle system is most often loose or corroded pedal 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
Random surging, hesitation or brief limp-mode events, sometimes on bumps or with the pedal at a specific position.
Common causes
- CommonLoose or corroded pedal connector ($80–$300)
- CommonWorn sensor track in the pedal assembly ($150–$500)
- OccasionalChafed harness under the dash or floor ($100–$400)
- RareECM connector fault ($200–$800)
How to fix
Graph the sensor B signal while slowly sweeping the pedal and wiggling the harness
When to use: First step
Clean and secure the connector and repair chafed wiring
When to use: When dropouts occur on wiggle test
Replace the pedal assembly
When to use: When dropouts occur at the same pedal position
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
- → P0200 — Injector Circuit Malfunction
- → P0201 — Injector Circuit Malfunction - Cylinder 1
- → P0202 — Injector Circuit Malfunction - Cylinder 2
- → P0203 — Injector Circuit Malfunction - Cylinder 3
- → P0204 — Injector Circuit Malfunction - Cylinder 4
Frequently Asked Questions
Can I drive with code P0224?
P0224 is severity 3 — plan service within a few days. Performance is likely degraded already (you may feel reduced power, harsher shifts, or slightly worse fuel economy). Continuing to drive risks additional damage to adjacent components.
How much does it cost to fix P0224 on a commercial truck?
Total repair cost ranges $80–$800 depending on the root cause. The cheapest fix is usually the first one listed below — Loose or corroded pedal 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 P0224 fail a DOT inspection?
P0224 is generally not a direct DOT inspection fail item by itself. Inspectors focus on safety-critical systems (brakes, steering, tires, lights, hours-of-service). However, the check engine light alone can trigger additional inspection scrutiny. Best practice: fix the code and clear it before a planned inspection.
What's the difference between P0224 and related codes?
P0224 is closely related to: P0200 (Injector Circuit Malfunction), P0201 (Injector Circuit Malfunction - Cylinder 1), P0202 (Injector Circuit Malfunction - Cylinder 2), P0203 (Injector Circuit Malfunction - Cylinder 3). These codes share the same subsystem (throttle) 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 P0224 is set without the companions, the issue is more isolated.
How do I prevent P0224 from coming back after a repair?
For P0224 (Throttle/Pedal Position Sensor B Circuit Intermittent), prevention centers on the throttle system. Clean throttle body at 100K mile intervals. Don't let carbon build up. Avoid extended idle time.