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Code reads engine coolant temp bus missing - 2002 Jeep Grand Cherokee

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Does the 98 Ford F-150 5.4 triton have two coolant sending units? I found the one on the intake and replaced it and still no gauge.


Has CHT - cylinder head temp. sensor . This sensor is a input to the PCM - engine computer . The PCM sends engine temp info on serial data network to the instrument cluster . I/C has a microprocessor inside . Have it check for DTC'S - diagnostic trouble codes . Not OBD2 codes , B - body codes . The gauge could be the problem , which means replacing the instrument cluster .
Engine coolant temperature information is received by the instrument cluster from the PCM over the SCP network. Temperatures over 121°C (275°F) will display hot (H). If the engine coolant temperature data is missing or invalid for five seconds, the instrument cluster will move the engine coolant temperature gauge below the cold (C) position.
The best way to diagnose this is with a scan tool , factory or a professional type . Know how the system works and not replacing parts is the proper way to diagnose .
U1073 D073 SCP (J1850) Invalid or Missing Data for Engine Coolant PCM CARRY OUT the PCM self-test.
  • A single gauge does not return to zero with the ignition switch off
  • Instrument cluster.
  • INSTALL a new instrument cluster; REFER to Instrument Cluster . TEST the system for normal operation.

  • Incorrect temperature gauge indication
  • Circuitry.
  • Instrument cluster.
  • PCM.
  • Engine coolant temperature sensor.
  • GO to Pinpoint Test F .

I should also point out that if the temp sensor were bad the vehicle may not run right .
Using the factory scan tool
Trigger instrument cluster active command ENGCOOLNT. Monitor the engine coolant temperature gauge while adjusting the ENGCOOLNT active command to read 50% and 100%.
  • Does the temperature gauge start at cold, move to half at 50%, and full hot at 100%?
Yes REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.

No INSTALL a new instrument cluster; REFER to Instrument Cluster . REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
Your best bet , take it to a qualified repair shop !

May 29, 2017 | Ford Cars & Trucks

1 Answer

1999. What are the probable causes of DTC P1624?


Definition of Diagnostic Trouble Code P1623 Audi: Data Bus Powertrain No Communication BMW: Pedal Position Sensor Potentiometer Supply Buick: Transmission Temp Pull-Up Resistor Cadillac: Transmission Temp Pull-Up Resistor Chevrolet: Transmission Temp Pull-Up Resistor Chrysler: ASD Relay/Control De-Energize Too Soon Dodge: ASD Relay/Control De-Energize Too Soon Ford: Code word/id number-write/read error GMC: Transmission Temp Pull-Up Resistor Hyundai: Diagnostic Lamp Powerstage Malfunction Jeep: ASD Relay/Control De-Energize Too Soon Land Rover: Immobilisation ECU code storage fault.Last occurrence - signal fault Lincoln: Code word/id number-write/read error Mazda: Immobilizer Code Word/ID Number Write Failure Mercury: Code word/id number-write/read error Oldsmobile: Transmission Temp Pull-Up Resistor Pontiac: Transmission Temp Pull-Up Resistor Saturn: Transmission Temp Pull-Up Resistor Volkswagen: Data Bus Powertrain No Communication Volvo: ETS .amp / MIL on

Jun 27, 2015 | Hyundai Elantra Cars & Trucks

2 Answers

I have a 2006 chrysler with a 5.7 liter Hemi engine. will the car misfire And run poorly if the engine coolant temperature sensor is bad it's not running on all cylinders and won't idle!


Coolant temp sensor can certainly cause "runs bad" symptoms, which can include missing and stumbling. Typically, it will be bad either when engine is cold or when engine is warmed up, and better at the other end. The lean/rich mixture is adjusted by the temp sensor...
If it won't idle at all, and won't fire on some cylinders at all, then there's more wrong with it. Got codes?

Jun 11, 2015 | Chrysler Cars & Trucks

1 Answer

How to repair P0125 for 2000 Mercury Mountaineer


P0125 OBD-II Trouble Code Technical Description Insufficient Coolant Temperature For Closed Loop Fuel Control What does that mean? This means that the engine coolant temperature (ECT) sensor indicates that the engine has not reached the required temperature level to enter closed-loop operation within a specified amount of time after starting the engine. Symptoms You will likely not notice any drivability problems. Causes A code P0125 may mean that one or more of the following has happened: Insufficient warm up time Low engine coolant level Leaking or stuck open thermostat Faulty coolant temperature sensor Possible Solutions The simplest thing to do is to reset the code and see if it comes back. If the code comes back, the problem is likely going to be the result of the above causes (faulty thermostat, faulty ECT sensor, or a low coolant level). Other ECT sensor and circuit related DTCs: P0115, P0116, P0117, P0118, P0119, P0128 Register now to ask a question (free) Related P0125 DTC Discussions 1996 chevrolet Caprice p0125 Car start properly but after 5 or 10 minutes driving start doing missing and stop. After that car will not start but 20 minutes it start but again stop, if you just start the care and don?t drive it will start 24 hours with no issue but if you will go for drive than you will stuck in middle of the r... P0125 on a Saturn Sc1 My grandpa's car has a p0125 check engine light on. Tha car will not start and is running rich on fuel. We tried replacing the fuel pump and filter, fuel injectors and even the coolant temp sensor and it didn't work. What else can it be? Here's the code. P0125- closed loop fuel control insufficien... 1997 corolla engine code p0125 Im getting code p0125 in my 1997 corolla and have changed thermostat coolant temp sensor and have topped up coolant level but code keeps reappearing any sugestions would be appreciated.... 2000 4runner P0125B code Engine light came on. Local garage read code as P0125B. Internet search says engine coolant temp. sensor which I will replace. Where is it located on 3.4L engine?... camaro codes p0404 p0505 p1404 p0304 p0122 p0125 Hey I got the codes when I ran my test p0122,p0125,p0304 P0404,p0405,p1404 was wondering what's all that and the price or it better to replace the motor...

Read more at: http://www.obd-codes.com/p0125
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May 18, 2015 | 2000 Mercury Mountaineer

2 Answers

1996 corvette didn't pass emissions codes po117 and po300 i just put new engine n tune up what could be wrong now


p0300 is usually a random cylinder miss-fire code, and i think that p0117 is coolant temperature sensor? Try replacing the sensor, could also be the reason for the other code, as a malfunctioning coolant temp sensor will affect engine timing.

Dec 14, 2010 | Chevrolet Corvette Cars & Trucks

1 Answer

Getting codes PO431, PO421, PO128


2003 saturn vue, we dont have the engine size, the codes should be and are the same, po 128 means; cooling temp is out of spec, make sure the coolant is full, then replace the coolant emp sensor and make sure the connection is good, i would also replace the thermostant, this is a common code on these and most of the time its the coolant temp sensor or thermostant, ive learned to replace then both to avoid future engine lights with code po128. next we will check the code # po421, this code is that the computer sees that the cat converters are taking to long to warm up, code po 431 is also the same as po421, this code is related to the thermostant and sensor, the sensor give the computer the wrong temp readings and then the compuetr thinks the engine is hotter than it is and thinks the converters should be also hot like the motor but the coolant temp is giving a false reading, if you replace the coolant temp sensor and the thermostant and fill coolant , then reset the light and you will solve the problem, i hope this is helpful, also the sensor is located to the right of the engine if you are standing in front of the motor, heres a picture of the sensor, remember to check connector heres a pic of the connector, good luck.johnjohn2_20.jpg

Nov 10, 2010 | 2003 Saturn VUE

2 Answers

Engine light came on and using to much fuel and missing at low speed driving


Get the engine light code read! It will tell you what sensor has gone out of range or stopped responding to the computer.

You probably have a coolant temp sensor going bad. That usually keeps the car in "open loop" mode which means it dumps a lot more fuel to warm up the vehicle until the coolant sensor says its ready to adjust things. No coolant sensor....no adjust! Running rich at low speed causes fouling and misses at low speed.

Good luck and be careful!

Dec 11, 2009 | 1997 Jeep Wrangler

1 Answer

2007 Chevy Cobalt with p0128 and "---" temp reading


The P0218 Code is primarily intended to indicate a faulty thermostat.
Have the thermostat replaced

Other possible causes that could trigger this code would be:
Low engine coolant level
faulty cooling fan
faulty coolant temperature sensor
faulty intake air temperature sensor


Sep 08, 2009 | 2006 Chevrolet Malibu

2 Answers

Coolant Temp sensor


The coolant temperature sensor should read at approx 1,800 ohms between 68 and 88 degrees F. As the temperature lowers, the resistance rises. More ohms. As the temperature rises, the resistance lowers. Less ohms. At 210 degrees, the ohms would be about .15 K ohms.

The 89 and the 12 figures are wrong.

Jan 17, 2009 | 1992 Toyota 4Runner

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