P0253 explained: Low-voltage fault on the metering circuit usually means the FCA solenoid is shorted, open, or the wiring is grounded. The engine often will not start until this is fixed.
🎯 Top Causes & Probability
55%
#1 - Most Likely
Shorted or Open Fuel Control Actuator
The FCA coil has shorted internally to ground or burned open. The most common cause on Duramax and Cummins diesels.
🔨 Part
$200-$700
👨🔧 Labor
$150-$500
⚡ DIY
Hard
25%
#2 - Check First
Wiring Shorted to Ground
A chafed wire grounding out against the engine block. Inspect the harness routing between the PCM and the pump.
🔨 Part
$30-$120
👨🔧 Labor
$100-$250
⚡ DIY
Medium
15%
#3 - Less Common
Failed PCM Driver
The PCM driver for that solenoid has shorted to ground internally. Confirmed only after the FCA and wiring test good.
🔨 Part
$500-$1200
👨🔧 Labor
$150-$300
⚡ DIY
Hard
🚗 Most Affected Vehicles
🔧 Step-by-Step Diagnosis
- Pull and inspect the FCA / pump connector. Look for melted plastic, green corrosion, or backed-out pins.
- Measure FCA resistance with the connector unplugged. Should be 2-8 ohms. Open (OL) or below spec = bad actuator.
- Check for continuity from the FCA ground pin to chassis ground. Should be only when the PCM commands it.
- Inspect the harness from pump to PCM for chafing. Pay attention to where it crosses the frame or engine mount.
- After repair, verify rail pressure responds correctly during start and idle.
- Drive 20-30 minutes under varying load to confirm the code does not return.
❓ Frequently Asked Questions
Will my truck start with P0253?
Often no. A shorted FCA prevents fuel metering, so no fuel reaches the rail. Cranking but no-start is the typical symptom.
Is P0253 covered under emissions warranty?
In most US states, federal emissions warranty covers powertrain emission components for 8 years / 80,000 miles. Check with the dealer.
Can a bad battery cause P0253?
Low cranking voltage can trigger transient low-voltage codes. Confirm battery voltage is 12.4V+ at rest and 9.6V+ during cranking before chasing parts.
Should I add fuel system cleaner?
Quality diesel additives help long-term but will not clear a hard electrical fault. Use only after the repair.
What is the difference between P0253 and P0254?
P0253 = low voltage (short to ground or open). P0254 = high voltage (short to +12V or open at the high side). Same solenoid, opposite failure modes.