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Error Code P1607 – Symptoms, Causes and Solutions

Code P1607: When the conditions monitored and established are DTCs shortly after an initial engine start, the difference between the coolant temperature and the ambient air temperature is less than 10°C (50°F) at the initial engine start.


The engine coolant temperature recorded at the last engine stop was higher than 83°C (181.4°F). If the previous engine shutdown temperature was not above this value, the shutdown diagnostic will not be performed during this ignition cycle.

Error Code P1607

If the above monitoring conditions are met, the PCM uses the engine coolant temperature drop to calculate a minimum ignition-off time threshold.

Reads: Error Code P1518 – Stuck Intake Manifold Spool Control Failure (Ford, Lincoln, Mercury)

It then compares the previous ignition-off time with the calibrated minimum threshold. He PCM determines that the actual pre-power-off time is less than the calculated minimum threshold. The MIL lights up.

What does the P1607 code mean on a DODGE caliber?

What does this mean? Low battery voltage. Defective alternator. Engine cooling conditions that can set the code. Engine coolant level.

What does the Dodge P1607 powertrain control module mean?

P1607 DODGE Meaning The powertrain control module (PCM) compares the actual shutdown time with a calculated shutdown time value. The calculated shutdown time value is based on the amount the ECT should drop after a fully warmed engine is shut down for a minimum of 8 hours.

Possible causes of code P1607

  • Cooling system problems
  • Ambient air temperature (AAT) sensor
  • Engine Coolant Temperature (ECT) Sensor
  • Powertrain Control Module (PCM) Software
  • Powertrain Control Module (PCM)

Symptoms of fault code P1607 Generic

  • Check engine light comes on

P1607 Code Diagnostic Test

See the following steps.

Step 1: Check the Powertrain Control Module (PCM) software level

An installed aftermarket block heater may cause this DTC to set. Turn on the ignition, and use the scan tool to verify that the PCM is operating on the latest available software version. Perform service bulletins or PCM flash updates as appropriate.

Were there service bulletins or PCM updates available for this condition?

Yes, make the corresponding repair.

No, go to step 2.

Step 2. Check the operation of the AAT sensor

Turn off the ignition, and allow the vehicle to remain with the ignition off in an environment where the temperature is constant and above -7°C (19.4°F) until the engine coolant temperature is at or near ambient temperature.

Turn on the ignition with the scan tool and compare the value of the ignition sensor. with the current ambient temperature.

Is the AAT sensor value within 10°C (18°F) of the current ambient temperature?

Yes, go to step 3.

No, it performs the PCM intermittent condition.

Step 3. Low coolant level

Never open the cooling system when the engine is hot, or the system is under pressure. Failure to follow these instructions may result in personal injury, including extreme burns, burns, or fatal injuries.

Let the engine cool before opening the cooling system. Check the cooling system to make sure the coolant is in good condition and at the proper level.

Is the coolant level and condition correct?

Yes, go to step 4.

No, inspect the vehicle for a coolant leak and add the necessary amount of coolant.

Step 4. Check the operation of the cooling system

If the engine coolant temperature is higher than 65°C (149°F), allow the engine to cool until it is below 65°C (149°F). Starts the engine, during engine warm-up monitors the value of the engine coolant temperature degree.

The temperature value change should be a smooth transition from startup to normal operating temperature of 82°C (180°F). It also monitors the actual coolant temperature with a digital thermometer at or near the ECT sensor and thermostat positions.

As the engine warms up to operating temperature, the actual coolant temperature (thermometer reading) and the scan tool’s engine coolant temperature degree value should remain relatively close to each other.

Was the digital thermometer reading relatively close to the scan tool reading for the ECT sensor?

Yes, go to step 5.

No, it replaces the ECT sensor.

Step 5. Check the connections of the PCM and related components

Possible solutions for DTC code P1607 Generic

To fix DTC code P1607 OBDII, try the following:

  • First, we recommend that you consult the Technical Service Bulletins. These will guide you and avoid making unnecessary changes or repairs.
  • Use a scanner to check if, in addition to the P1607 There are other fault codes. In this case, diagnose them following the order indicated by the tool.
  • Check the PCM connections to verify that they meet the conditions for proper system operation. If you find worn or burned cables, make the appropriate repairs.
  • To check the integrity of the PCM and ECM, we recommend that you visit an advanced automotive center before performing any reprogramming or replacement.

Questions and answers

Ask: The CEL came on today about 8 miles into normal driving, at normal operating temperature, without any symptoms. I found this code:

P1607 Serial communication problem with device 7 or

Google search says it’s the powertrain control module. It could be intermittent/bad connection at the connector(s). It could also indicate an inconsistent coolant temperature reading, according to some sources. Apparently, the car takes a coolant temperature reading at shutdown, then a timer tracks how long until the next start, and an algorithm exists for how long the engine should cool down. If the reading is inconsistent, the code and light activate. It takes 3 good cycles to clear the code.

Does anyone have any experience with this? I turned around and drove home with no problems, it ran and shifted fine the entire way.

Answer: I looked at this error in three different service manuals I had (2005 LX, 2006 Durango, 2005 Dakota) and they all give similar information.

The CEL turns on after one occurrence, three sequential good trips should turn off the CEL.

The test involves a wiring check from the PCM connector (sorry, I don’t have a service manual for your car that tells you which pins) using the Miller 8815 tool (sounds like a special test light that won’t damage the pins on the PCM connector) with two circuits on off, ignition, start, etc.

These service manuals don’t mention anything about the coolant temperature sensor so I don’t know if that is a difference between these vehicles and your car’s system. So if it’s not the wiring, it’s the PCM.

If you want to know other articles similar to Error Code P1607 – PCM Internal Shutdown Timer Rationality you can visit the category Fault Codes.


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