Trouble Code Explanation

See CHARGING SYSTEM TROUBLE CODES table for charging system-related failures.
Code 12 will set if battery feed to PCM has been disconnected within last 50 starts. PCM monitors circuit when ignition is on.
Code 41 will set if PCM detects an open or short in alternator field control circuit. PCM monitors circuit when ignition is on.
Code 46 will set if battery sense voltage is more than one volt above desired control voltage for more than 20 seconds. PCM monitors this signal whenever engine is running.

Code 47 will set if battery sense voltage is more than one volt below desired control voltage for more than 20 seconds, and active test indicates an alternator problem. PCM monitors this signal whenever engine speed is above 1500 RPM.

CHARGING SYSTEM TROUBLE CODES

Code

Description

MIL On?

Battery Feed To PCM

41 ⁽¹⁾

Alternator Field Control

Yes

46 ⁽¹⁾

High Battery Voltage

Yes

47 ⁽¹⁾

Low Battery Voltage

Yes

End Of Diagnostic Mode

⁽¹⁾	This code will cause limp-in mode.

NOTE: Only charging system-related codes are listed here. For engine-related codes, see TESTS W/CODES - 3.3L & 3.5L article in the ENGINE PERFORMANCE section as listed below.