Electronic Automatic Temperature Control (EATC) Module Diagnostic Trouble Code (DTC) Index
WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Some PCM DTCs may inhibit air conditioning (A/C) operation. If any PCM DTCs are retrieved, diagnose those first. REFER to the
INTRODUCTION - GASOLINE
article.
ELECTRONIC AUTOMATIC TEMPERATURE CONTROL MODULE DIAGNOSTIC TROUBLE CODE INDEX
| DTC | EATC (Hard) Self-Test Faults | EATC (Intermittent) Run-Time Faults | Description | Action to Take |
|---|---|---|---|---|
| B1249 | 024 | 025 | Blend door short or failure | GO to PINPOINT TEST A . |
| B1251 | 031 | N/A | In-vehicle temperature sensor open circuit | GO to PINPOINT TEST B . |
| B1253 | 030 | N/A | In-vehicle temperature sensor short to ground | GO to PINPOINT TEST B . |
| B1255 | 041 | 043 | Ambient temperature sensor open circuit | GO to PINPOINT TEST C . |
| B1257 | 040 | 042 | Ambient temperature sensor short to ground | GO to PINPOINT TEST C . |
| B1261 | 050 | 052 | Solar radiation sensor circuit short to ground | GO to PINPOINT TEST D . |
| U1073 | N/A | N/A | SCP invalid or missing data for engine coolant | If DTCs are present in the instrument cluster, diagnose those codes first. CLEAR the DTCs. If the EATC DTC returns, INSTALL a new EATC module. REFER to
CLIMATE CONTROL
. TEST the system for normal operation. If no DTCs are present in the instrument cluster, CLEAR the DTCs. If the EATC DTC returns, INSTALL a new EATC module. REFER to CLIMATE CONTROL . TEST the system for normal operation. |
| U1341 | N/A | N/A | SCP invalid or missing data for function read vehicle speed | REFER to the INTRODUCTION - GASOLINE article. |