Powertrain, generic (extended)

P2D49 Hybrid/EV Battery Pack E Over Temperature

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2D49 says that section E, the fifth separately monitored part of a traction battery, is hotter than permitted. One trap with every pack over-temperature code is heat produced after the car has been switched off. Subaru's 2014–16 Crosstrek Hybrid illustrates it: bulletin 11-185-18 explains that the battery warms itself slightly by self-discharge after shutdown, the original controller logic allowed too little for this, and motor assist, regeneration and auto start-stop then stopped working under P0A7E; reprogramming solved it without a new battery. No manufacturer documents P2D49 publicly. CARB calls for monitored battery temperature inputs and cooling. A code that only appears after parking with no other finding hints at software.

Likely causes

Battery controller logic or threshold too strict for normal post-shutdown warming (software update)
Reduced cooling of section E (coolant flow, fan, duct)
Parking in strong sun or heat after hard use

Symptoms

  • Hybrid warning light, sometimes only after the car has stood
  • Motor assist and regeneration unavailable
  • Auto start-stop no longer works

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–4,000
Time1–10 h

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

Parts involved

hv battery pack ebattery thermal managementbattery energy control module

Related codes

P2D48P2D4AP0A7EP0EE0

References: law.cornell.edu, static.nhtsa.gov.