Web Reference: 2013 GMC Terrain Rough Idling: Diagnosing the 7E8 Code Terrain models often face rough idling and engine hesitation related to sensor or ignition issues. The 7E8 code indicates a generic powertrain communication from the PCM. Rough idling can stem from faulty ignition coils, spark plugs, or a dirty throttle body. The 7E8 is an engine data menu. The 7E9 is the same for the transmission. Is the check engine light staying on when the engine is running? Are you experiencing any engine or transmission issues? How were these identified? If you are experiencing issues without a check engine light, what I suggest is this. The CAN system needs to be scanned. Codes 7E8 and 7EB are generic OBD-II response IDs from the engine control module (ECM) and transmission control module (TCM), not fault codes themselves. The code 'EA' is likely a misread or manufacturer-specific code. To diagnose, use a compatible OBD-II scanner to retrieve actual trouble codes from these modules.
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