Powertrain, generic (extended)

P2510 ECM/PCM Power Relay Sense Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2510 judges whether the main relay of the engine module behaves as commanded, based on what the module senses on the switched supply. GM's 2014 diesel tables describe two checks. A stuck relay is one that ignores the power-down command, recognised when timer values after the after-run are longer than possible; GM counts such events in EEPROM and sets the code once the count exceeds 2 (14OBDG04) or 1 (6.6 L LML, 14OBDG10). A relay that opens too early is seen when the EEPROM write that should close the previous after-run is missing. Both run once per trip in pre-drive, type B. Ford lists P2510 for the 2014 BOSS 302S. Pure sense-circuit faults are P0689/P0690, P2511 the intermittent case.

Likely causes

Main relay contacts welded or sticking
Relay dropping out early (weak coil, poor socket contact)
Battery disconnected or supply lost during after-run
Relay driver or EEPROM handling in the module faulty

Symptoms

  • MIL after two trips (GM type B)
  • Battery drain if the relay stays closed
  • Lost adaptations if the relay opens too early

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–500
Time0.3–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

main relayecm

Related codes

P2511P0685P0689P0690

References: gsi.ext.gm.com, gsi.ext.gm.com, performanceparts.ford.com.