P1188
System
Powertrain (Fuel/Air)
Scanner required
Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Fuel Delivery Error (GM)

Understand P1188, common causes, and the right SEAFLO pump to diagnose it.

GM fuel delivery system not meeting commanded fuel mass — pump, injector, or pressure issue.

Common symptoms

  • Loss of power
  • Misfire under load
  • Long crank

Typical causes

  • Weak fuel pump
  • Clogged filter
  • Injector flow imbalance
  • Fuel pressure regulator fault

What scanner do you need?

Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Use live data and freeze frame to confirm the fault before replacing parts. ABS, SRS, and network U-codes usually require a full-system scanner.

Diagnostic tips

  • Record freeze frame data when the code first sets
  • Clear the code only after fixing the root cause
  • Check for related pending codes that point to a common issue
  • Verify battery voltage is above 12.4V before chasing sensor codes

Frequently asked questions

Can I diagnose P1188 with a basic code reader?
P1188 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Is it safe to drive with P1188?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.