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Check engine light on, code p1633 pops up, battery good what now!

I had the battery tested and it shows 11.98 volts but the check engine light is still on what do i look for next

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  • Anonymous Mar 12, 2009

    P1633 CODE STORED

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Check the alternator you should be getting more volts than that..

Posted on Jan 21, 2009

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Got code p1633 I changed the battery, but my lights to my radio and clock are very dull at times, sometimes there fine, what could it be?


P1633 - Keep Alive Power (KAPWR) Voltage Too Low Description: Indicates the KAPWR circuit has experienced a voltage interrupt. Possible Causes:
  • Open KAPWR circuit
  • Intermittent KAPWR
Diagnostic Aids: Loss of KAPWR to the powertrain control module (PCM) results in immediate malfunction indicator lamp (MIL) illumination and DTC P1633. Application Key On Engine Off Key On Engine Running Continuous Memory All GO to Pinpoint Test QB .

Jan 11, 2016 | 2007 Ford Explorer Eddie Bauer

2 Answers

Car cranks very slowly==intermittent shows 14 volts most times starts fine


That is normal there is a dile on the dash that controls the timer on that.

Apr 28, 2015 | 1999 Oldsmobile Aurora

1 Answer

I have 2000 mustang 3.8 n it shakes really bad n code p1633 comes back. Whats wrong n how do i fix it


Hello Paige ! It sounds like you have a sick vehicle , lets see if I can help you fix it . Well the code you have has to do with lack of voltage to the ECM -engine control module.
P1633 - Keep Alive Power Voltage Too Low Indicates that the Keep Alive Power (KAPWR) circuit has experienced a power interrupt.
  • Open KAPWR circuit
  • Damaged PCM
  • Intermittent KAPWR Circuit
2000 PCED On Board Diagnostics II SECTION 5: Pinpoint Tests Procedure revision date: 01/31/2001 QB: Diagnostic Trouble Code (DTC) P0603/P1605/P1633 > QB: Introduction QB1 CHECK BATTERY TERMINALS
    Note: If KAPWR is interrupted to the PCM (that is, when a breakout box is installed or the battery is disconnected), DTC P0603/P1605 can be generated on the first power-up.
  • Inspect the battery cables for loose connections, corrosion.
Are the battery terminal connections in good condition? Yes No KEY OFF. Battery terminals are OK. GO to QB2 . REPAIR battery terminals as necessary. QB2 INSPECT ENGINE COMPARTMENT FOR PROPER WIRE ROUTING
  • Inspect Electronic Engine Control (EC) System wiring for proximity to ignition components or wires.
Is wiring too close to ignition components or wires? Yes No REROUTE as necessary. Engine compartment wire routing is OK. GO to QB3 . QB3 CHECK KEEP ALIVE POWER (KAPWR) TO PCM
    Note: Refer to the PCM connector pin numbers in the beginning of this pinpoint test.
  • Disconnect PCM.
  • Measure voltage between KAPWR circuit at the PCM harness connector and ground.
  • While observing digital multimeter, grasp the Electronic EC harness and wiggle, shake or bend a small section while working from the PCM to the dash panel.
Does the voltage reading indicate less than 10.5 volts? Yes No ISOLATE and REPAIR open circuit. No open in KAPWR harness circuit detected. GO to QB4 . QB4 CHECK FOR REPEAT OF DTC P0603/P1605/P1633
  • Reconnect PCM.
  • Start engine and allow it to reach operating temperature.
  • Run Key On Engine Off Self-Test.
  • Retrieve Continuous Memory DTCs.
Is DTC P0603, P1605 or P1633 present? Yes No REPLACE the PCM. REPAIR other DTCs as necessary. If none, testing is complete. You may want to take this to the repair shop , do you own a volt ohm meter ? Do you know how to use one ?

Mar 14, 2015 | 2000 Ford Mustang

1 Answer

My 1999 ford f150 has amiss fire and the p1633 code came up but the service engine light is not on


P1633 means the battery was disconnected or became discharged enough to be unable to keep the battery-backed memory in the control module alive.

If the alternator is failing intermittently, it may not always keep the battery charged enough to properly run the engine, which could cause misfires. Ensure the battery and its terminal connections are in good shape.

I am trying to connect the two facts you listed. Your facts may not be enough to find the actual cause of the misfire, however. Certainly a disconnected or otherwise discharged battery will cause the P1633 code.

Feb 11, 2015 | Ford Cars & Trucks

1 Answer

98 chevy prizm completely dead. Need to check fuse but don't know which one


You have to start at the battery. Is it fully charged? It should show at least 12.6 volts to verify a good battery. If it is less than 12 volts, it will not start the engine anyway, so it must be tested and recharged if good, or replaced if bad. Next the positive and negative cables at both ends of them must be clean and tight. By now you should be able to have headlights and other accessories. And the key turned to on should light up all the warning lights and gauges on the dash, and when turned to "start", the engine should be cranking over and then run.

If the car is completely dead, start at the battery. If you still suspect fuses, next check all the maxi fuses- the power distributors right after the battery. Only one of them would cause whole differing circuits to not have power.

Dec 09, 2014 | 1998 Chevrolet Prizm

1 Answer

Alternator problem


Easy way to check with a voltmeter. Check battery voltage on the battery terminals with key off, engine off, and then check voltage with engine running.
Engine off, a good battery should have voltage between 12.6 volts and 12.9 volts. With engine running, battery voltage should be a minimum of 13.5 volts, somewhere between 13.5 and 14.5 volts. This would indicate the alternator is good and is charging the battery. If voltage is less than 13.5 volts, if it only shows same volts as when not running, the alternator is not working right. Take it off and have tested for free at a parts store. It could be a bad alternator or it could be that the wiring between alternator and battery has a problem. If alternator tests good, start looking into the connections between alternator and battery.
Does your battery or alternator light stay on when engine is running? This would indicate a charging system problem. Time for the voltmeter test.

Apr 10, 2014 | 2000 Toyota Avalon

1 Answer

Battery light stays on


Batteries are difficult to test properly. They must be tested under load to determine the internal resistance... once the internal resistance is too high then you must replace the battery. Using a multimeter test the voltage. Write it down. Then turn on the headlights maybe even the radio and the blower, wipers etc (leaving the engine off) then take a voltage reading again. A charged battery should be near 14 volts readings below 12 volts shows a bad battery.

Oct 18, 2013 | Cars & Trucks

1 Answer

Problem with lights on my tracker it drain's my battery i have a good altnator on it


If the lights drain the battery when the engine is running, then you have a bigger problem of the alternator not charging, not working. When the engine is running, the alternator supplies all the current to run the car's electrical systems, while also charging up the battery for the next start-up. If you know the alternator is good, then maybe a fuse or fusible link has blown, preventing the alternator from working. To check, put a voltmeter on the battery with engine running-it should show over 13.5 volts if the charging system is working. If the alternator is not putting out, the voltmeter will read same voltage on the battery as when the engine is not running. A fully charged battery should show "around" 12.6 volts. A discharged battery will show less than 12 volts. That should give you an idea of the range to look for on a voltmeter. I believe some parts stores will check the voltage for free. I know most stores will test the alternator and battery for free if brought into the store, but you need the voltage read while on the car and engine running. If the system is charging normally and the lights kill everything, you may have a short in the lighting system.

May 05, 2013 | 1994 Geo Tracker

1 Answer

How can i know if my voltage regulator is working, Im not getting any of my lights to work


quick check is to remove a battery cable while the motor's running. If the motor stays running when you pull off the battery cable, the charging system is functioning properly, if it dies then there is a problem with the charging system. Don't leave it off long, as this test is stressful to the circuit. You can test the voltage regulator by putting a volt meter across the battery posts to verify voltage. A fully charged 12 Volt battery should show slightly above 12 volts DC. With the engine running and the volt meter hooked to the battery, the charging system should be showing around 13.8 volts DC.

Dec 02, 2012 | Cars & Trucks

2 Answers

I have a 2003 ford taurus 3.0 engine and everytime i use the ac or heat i blow a fuse and engine light comes on with p1633 code


Put OBD2 P1633 into google for the answer

Only have PO Generic Codes-- the same as you should
find & print out

Sep 15, 2012 | Cars & Trucks

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