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Unread 08-05-2007, 08:31 AM   #16
T-Rated
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Join Date: Jan 2007
Location: SoCal
Posts: 392
First glance on the P2181 is Cooling System; often the sensor.

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Unread 08-05-2007, 12:26 PM   #17
merlinTec
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P2181-COOLING SYSTEM PERFORMANCE

Set Condition:
PCM recognizes that the ECT Sensor has failed its self coherence test. The coolant temp should only change at a certain rate, if this rate is too slow or too fast this fault will set. Two trip fault. Three good trips to clear MIL. The MIL and ETC light will illuminate.

· Possible Causes

LOW COOLANT LEVEL
(K2) ECT SIGNAL CIRCUIT SHORTED TO VOLTAGE
(K2) ECT SIGNAL CIRCUIT OPEN
(K900) SENSOR GROUND CIRCUIT OPEN
(K2) ECT SIGNAL CIRCUIT SHORTED TO GROUND
(K2) ECT SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT
THERMOSTAT
ECT SENSOR
PCM

NOTE: If an Engine Coolant Temperature (ECT) DTC is set along with this code, diagnose the ECT DTC first.

NOTE: Inspect the ECT Sensor terminals and related PCM terminals. Ensure the terminals are free from corrosion and damage.

NOTE: The best way to diagnose this DTC is to allow the vehicle to sit overnight outside in order to have a totally cold soaked engine.

NOTE: Extremely cold outside ambient temperatures may have caused this DTC to set.

NOTE: Need to make sure that no Cooling System DTCs are set or changes that would make the warm up much slower or much faster: broken water pump can set this, addition of aftermarket auxiliary cooler can set this DTC.

Was that the only code? I see there is a software update for the PCM but not for your fault but always best to have the latest software level so I would ask them to check this and update if it has not already been done.
Regards,
Merlin
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Unread 08-05-2007, 01:53 PM   #18
heesman
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Location: Duluth, MN
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Merlin,

Thanks for the reply!

The last time it was at the dealership they updated the PCM - they affixed a sticker under the hood stating that they did. So I know that part has been taken care of.

I will call the dealer first thing tomorrow morning.

Thanks again, I really do appreciate experts chiming in - very, very cool.

Eric
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Unread 08-05-2007, 01:59 PM   #19
merlinTec
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Hi Eric
they should have put the part number on that label if you want me to I can tell you if it's the latest update.
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