I HAD SAME CODE TO BUT NOTE THE CODES MIS READING DUE TO THIS Check under seat unplug control module see if it is wet with fluid . cost me $138.00 fee. Engine light on than next day off may 2 day then on at same place drive kid to school. issue with transmission fluid wicking up the harness into the control module and causing the module to malfunction. Usually, the harness from the transmission to the ETC module is replaced and the module is replaced provided the leak is repaired. In some cases this may be more than is actually needed but it usually fixes the concern. Transmission fluid does not actually damage the module and can be flushed away with board cleaning solvent or electrical contact cleaner as a first attempt. Always repair the leak before replacing a module.
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DTC P0671: Cylinder #1 Glow Plug Control Circuit
DTC P0672: Cylinder #2 Glow Plug Control Circuit
DTC P0673: Cylinder #3 Glow Plug Control Circuit
DTC P0674: Cylinder #4 Glow Plug Control Circuit
DTC P0675: Cylinder #5 Glow Plug Control Circuit
DTC P0676: Cylinder #6 Glow Plug Control Circuit
DTC P0677: Cylinder #7 Glow Plug Control Circuit
DTC P0678: Cylinder #8 Glow Plug Control Circuit
The glow plug controller has the ability to perform internal checks, an open or a short to ground on each of the glow plug circuits. If the glow plug controller senses a problem in a glow plug circuit, the glow plug on the affected cylinder will be disabled and the glow plug controller will send an error message to the engine control module (ECM). If this condition exists, the DTC will set.
Conditions for Setting the DTC
The glow plug controller detects that the glow plug control circuit is open, shorted to ground, or has more than 1 ohm of resistance.
Verify that DTC P064C is not set.
If DTC P064C is set, refer to DTC P064C.
Ignition ON, engine OFF, observe the scan tool Glow Plug 1-Glow Plug 8 parameters. All 8 Glow Plug parameters should closely match each other.
Refer to Testing for Intermittent Conditions and Poor Connections if you cannot duplicate the conditions.
Engine running, observe the DTC information with a scan tool. DTCs P0671-P0678 should not set.
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
DTC C0035 Left Front Wheel Speed Sensor Circuit
DTC C0201 Antilock Brake System (ABS) Enable Relay Contact Circuit
The system relay, located within the electronic brake control module (EBCM), supplies battery voltage to all of the valve solenoids and to the ABS pump motor. When the relay contacts close, the EBCM monitors the voltage supplied to the valve solenoids and compares this voltage to monitored ignition voltage.
CODE PO380 GLOW PLUGS CIRCUIT A MALFUNCTION. POSSIBLE CAUSES. GLOW PLUG RELAY CONTROL CIRCUIT IS OPEN SHORTED TO POWER OR GROUND CIRCUIT IS OPEN, GLOW PLUG RELAY IS STUCK IN POSITION CAUSING CONSTANT POWER, GLOW PLUG RELAY IS DAMAGED OR HAS FAILED, PCM HAS FAILED.
P0380 - Glow Plug/Heater Circuit "A" Malfunction Bad glow plug. The glow plug system is used to assist in providing the heat required to begin combustion during cold engine temperatures. The glow plugs are heated before and during cranking, as well as initial engine operation. The engine control module (ECM) controls the glow plug ON times by monitoring coolant temperature and glow plug voltage. The California Glow Plug system has eight individual glow plug supply circuits between the controller and the glow plugs. If the feedback voltage from the controller to the ECM is not within range, DTC P0380 will set.
- The glow plugs are commanded OFF and the glow plug feedback is more than 2 volts. or - The glow plugs are commanded on and the glow plug feedback is not between 5 volts and 6.2 volts.
Keep in mind that the "wait to start" light only comes on while the
voltage is dropping in that circuit. This should only take 3-5 sec's. If
it takes longer, refer to your "Likely problem" you listed above. That
would be the Heater Module. If your glo plugs stay on, your batteries
would be dead in no time. If any of your plugs go bad, they would each
be listed on the reader per cyl 1-8. If you need to change the Module,
P1316 - Injector Circuit / IDM Codes Detected. This code indicates that codes are stored in the IDM
Possible causes are as follows: - Injector(s) or circuit(s) - Open or shorted IDM enable circuit - Open/short in EF circuit - Open/short in FDCS circuit - IDM relay - IDM powering circuits - Failed IDM - Failed PCM
Check your Injector Driver Module wires, circuits 821 (Brown/Orange) and 818 (Grey/White) between the PCM and IDM. On the IDM side, the connector pin numbers are 17 for circuit 821, and pin 4 for circuit 818. You should check for high resistance in that circuit, short to ground, or open circuits. If wiring checks out good, you may need to replace your IDM. It's not uncommon for water intrusion into the module, due to its mounting location. Also check the engine wiring harness where it routes up over the driver side shock and/or driver side valve cover. That code is either a key-on/engine-off or a continuous memory code.
The code P0674 tells you that something in the glow plug circuit is faulty causing the glow plug on cylinder #4 to fail to heat up. The entire circuit must be checked to locate the fault.
Symptoms With just one glow plug failure other than the check engine light coming on, the symptoms will be minimal since the engine will normally start with one bad plug, under freezing conditions you would be more likely to experience hard starting.
Potential Causes The causes for this DTC may include: Faulty cylinder #4 glow plug Open or shorted glow plug circuit Damaged wiring connector Faulty glow plug control module Diagnostic Steps & Possible Solutions You will need a digital volt ohm meter (DVOM) for the complete test.
Continue through the tests until the problem is confirmed. You will also need a basic OBD code scanner to reset the computer and erase the code. Check the cylinder #4 glow plug by disconnecting the wire connector on the plug. Place the DVOM on ohms and place the red lead on the glow plug terminal and the black lead on a good ground. The range is .5 to 2.0 ohms, if it is out of range replace the glow plug.
I did this exact thing.. I see your date of posting is a while ago, however let me know how you ended up.. If you leave the battery connected while installing the relay you can short it out causing the problem all over again.. also there is a couple points that run along that wiring harness that are known to rub through.. let me know how you did!