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P1637 code - Jeep Cars & Trucks

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I have a 99 chevy silverado truck 5.7 vortec.When i start it run for awhile and stats surging and cuts off. then it wont start back.i get codes po118 and p1637. can u tell me what i need to do.


Are you saying it cranks good but won't start? The first code is for coolant temp sensor and it can cause problems. I can't be positive replacing sensor will fix, I usually check sensor wiring circuits, first. The second code is for generator lamp control, your charging system works ok?
Just to add, if you have that spider fuel system, it is known for problems.

Mar 19, 2017 | Cars & Trucks

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On a bmw 2000 540i im only getting 2500 rpm out of motor with full throttle n a code of p1637 p0100 where do i start checking please advise me as what this relates to.


code p 0100 refers to mass air flow (MAF) sensor /volume air flow (VAF) sensor--circuit malfunction=== causes --wiring ---MAF/VAF sensor ---ECM
code p1637 refers to throttle valve position control---control deviation===causes---wiring ---
Throttle valve position control unit
take it to an accredited service shop with experience on your vehicle and discuss which would be the most likely unit to be faulty or replace the lot if you have cash to splash

Feb 22, 2017 | BMW Cars & Trucks

1 Answer

I have this errors code to this car.p1637,p1638,p1699 and p1260.i change the batery and check all conectors .any ideea please?


What make , model an year vehicle ?
Generator L Terminal P1637? / Possible alternator problem The powertrain control module (PCM) uses the generator turn on signal circuit to control the load of the generator on the engine. A high side driver in the PCM applies a voltage to the voltage regulator. This signals the voltage regulator to turn the field circuit ON and OFF. When the PCM turns ON the high side driver, the voltage regulator turns ON the field circuit. When the PCM turns OFF the high side driver, the voltage regulator turns OFF the field circuit. Strongly suggest you take your vehicle to a ASE certified repair shop or the dealer .

Mar 15, 2016 | Cars & Trucks

1 Answer

I have a 2002 chevy tahoe 4X4 with a 5.3L that has set a P1258 code engine over temp, it has also set a P0117 ect low input code, and a P1637 L terminal circuit, P1638 F terminal circuit codes.


If these codes are being only set during start I would expect a failure of the battery. If the voltage goes much below 9 VDC the computers (EMS) can become erratic and codes and limp home modes are a common result of defective and discharged batteries!



Careful having the battery tested. Any arcing etc at the battery can be the kiss of death for the engine computer. Better to remove terminal to check. Or test the crank voltage with multi-meter.

Mar 05, 2016 | Cars & Trucks

1 Answer

My battery light went on, on. My 2003 GMC ENVOY, the message board said "battery not charging" .....I took it to autozone and they said I had a bad alternator which is why it would say battery not...


The charging system on your vehicle is Computer controlled . called ( smart charging system )
BATTERY NOT CHARGING
The IPC illuminates the battery not charging indicator in the driver information center when the following occurs:
• The PCM detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the PCM requesting illumination.
• The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the body control module (BCM) indicating the system voltage.

Do you know what DTC'S - diagnostic trouble codes are ?
DTC B1327
DTC B1328
DTC P0562
DTC P0563
DTC P0621
DTC P0622
DTC P1633
DTC P1634
DTC P1637
DTC P1638
These codes are all associated to charging system problems .

Battery light lit on the instrument cluster ?


Are You Smarter Than Smart Charging System MOTOR

Oct 27, 2017 | Cars & Trucks

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2003 s-10 changed motor, now won't start. you can


CODE P1637 - GENERATOR L TERMINAL CIRCUIT MALFUNCTION CONDITIONS. CODE P1638 - GENERATOR F TERMINAL CIRCUIT MALFUNCTION CONDITIONS. POSSIBLE CAUSES FAULTY GENERATOR WHICH IS ALTERNATOR.CHECK GENERATOR POWER FEED WIRES AND CHECK GENERATOR VOLTAGE REGULATOR WIRES FOR LOOSENESS AND DAMAGE. MAKE SURE BATTERY VOLTS ARE 12.6 VOLTS. IF BATTERY WEAK DUE BAD GENERATOR VECHICLE WONT START.

Sep 23, 2011 | 2003 Chevrolet S-10

1 Answer

Thses codes came up on the diagnostic test. I found the p111 code. I need to know what these code are for p1637, p1642? The codes p0174& p0171, I think they are oxygen sensors. I am worried about the...


ok here we go p111= IAT circuit range problem po171 bank 1 lean po174= bank 2 lean The other codes p1637 and p1642 have to do with the CAN system (Controled Area Network) could have to do with the type of scan tool used.Sounds like you might have a vacuum leak. Make sure when you scan this car you use a scanner capable of communicating with a European CAN. if you need more help get back to me. Hope this helps Thanks Ray

Feb 18, 2010 | 2002 Jaguar X-Type

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2002 Chev. C1500HD pickup 6.0 engine has code P1637


the generator / alternator has sensed an improper voltage at the L terminal circut for more than 30 seconds, check terminals for corrosion and or connection.. with the engine running there should be roughly 5 volts at the connector term L and ground, good luck

Nov 24, 2009 | 2001 Chevrolet Silverado 1500

1 Answer

Service Engine soon light flashing or constant


code 1637 is a generator l circuit code code 300 is a multiple misfire code. from what you are describing i would lean towards wiring problem with alternator circuit.

The L-terminal circuit from the generator is a discrete circuit into the Powertrain Control Module (PCM) . The PCM supplies the ignition voltage to the generator lamp feed. This ignition voltage is pulled low by the generator once the ignition switch supplies ignition 1 voltage . The voltage stays low until the generator turns. When the generator is up and running, the PCM detects ignition voltage. Therefore, with no failures with the vehicles charging system, the lamp terminal circuit will go low 0 volts when the ignition switch is powered up and then goes to the ignition voltage after the engine is started.

I find it hard to believe you need a third alternator. if you do something is going on to burn them up. have them check wires might have a harness rubbed thru grounding out at times

Jan 26, 2009 | 2000 Chevrolet Silverado

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