Powertrain, generic (extended)

P2544 Torque Management Request Input Signal A

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2544 concerns torque requests that another module, usually the transmission control module, sends to the engine module – for example to cut torque during a shift. GM's 2020 table 20OBDG04 checks each TCM message for a wrong protection value (16 of 20), a broken rolling counter (6 of 10), an increase request above 1,298 Nm (6 of 10) or the request type toggling too often (3 of 5), type B with two trips. GM's 2012 bulletin PIC4740C for 2006–2013 Cadillac ATS, CTS, SRX and STS with six-speed automatics traces P2544 with many U-codes, hard shifts and no-crank to loose pins in the transmission X1 connector. A GM engineering bulletin on the 2019–2022 Malibu 1.5 L turbo names it next to lost-communication codes; Ford's BOSS 302S list of 2014 has it without a lamp mark. P2545 is the plausibility fault.

Likely causes

Loose or unseated pins at the transmission connector
Data bus disturbance or failing gateway
Transmission module software or internal fault

Symptoms

  • Check engine light, often with several U-codes
  • Harsh shifts or reduced engine power
  • Multiple warning lamps, possibly no-crank

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–800
Time0.5–4 h

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

Parts involved

can bustcmabs module

Related codes

P2545P2546P2547P2548P0700U0101

References: gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov, performanceparts.ford.com.