Question about 1999 Pontiac Grand Prix

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1999 grandprix code po502

Replaced speed sensor did not fix problem speedo dose not work and will not shift if you clear ode it will shift once is ecm a problem on the 99 gradprix

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  • Pontiac Master
  • 5,678 Answers

Check wires and connection.

Posted on Dec 28, 2013

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  • Pontiac Master
  • 803 Answers

Check harness / wiring for continuity , damage , chaffing, connector contact, etc... from speed sensor to ECM.

Posted on Dec 28, 2013

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Posted on Jan 02, 2017

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SOURCE: where do i locate my vechicle speed sensor on 99

Take the car to autozone. They will do a free scan and tell you what the codes mean.

Posted on Oct 19, 2009

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SOURCE: 1999 pontiac grandprix knock sensor ,low input

There is only 1 knock sensor on the engine. Check the connector first, and make sure you are running a decent grade of gas. You may need to replace the sensor if all else is okay

Posted on Jan 15, 2010

csmock132
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SOURCE: how to replace a crankshaft sensor on a 1999

On the 3.8 engine it is on the front of the motor by the waterpump. Just unplug it, unbolt it and remove it. On the 3.4 engine, you have to remove the Power steering pump to get to the sensor.

Posted on Aug 11, 2010

ZJLimited
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SOURCE: 97grand am code P0118 replaced ect sensor clear

Engine coolant temperature (ECT) sensor is a thermistor screwed into a coolant passage in the cylinder head. Sensor resistance is high when coolant temperature is low and resistance drops when coolant temperature increases. The powertrain control module (PCM) provides a 5 volt reference and a ground to the sensor. The PCM monitors voltage drop to determine coolant temperature. If the ECT reads less than freezing temp. when engine has been running for more than a few minutes, the PCM determines a circuit fault and sets this code. Or if the PCM determines the sensor resistance is out of specs, this code is set.

The reference values given below are measured between ECM terminal 72 and ground...



zjlimited_9.jpg


When measuring input / output voltage be careful not to use ECM ground terminals. The ECM will enter fail safe mode once a malfunction is detected and the MI will light up.

Usually, P0118 is indicative of a bad temperature sensor, but doesn't rule out these other possibilities. If you're unsure of how to diagnose a PCM, do not attempt.

Keep us updated.

Posted on Nov 04, 2010

dttech
  • 4803 Answers

SOURCE: getting a no signal code and speedo control code i

A speedo control code? Or are you trying to say Speed Control. Does your speedometer work? If your speedoeter works, you are trying to fix the wrong thing. "Speed Control" has to do with your cruise control system, not your speedometer. What code do you have exactly?

Posted on Jan 11, 2011

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1 Answer

I have a 1999 suzuki grand vitara 2.0 5 speed what speed sensor do I need and what colour


easter egg hunt 1million
Car speed?
or ABS speed sensors. we cant guess, whats wrong, can we.?
USA car,? we are USA, cars not here are vastly different.
so........????????
why ask not telling problem? scans told you sensor is bad
post the DTC error. speedo dead.Odom, dead? what?
J20 engine ,
5 speed stick shift box. manual trans,,m/t
4wd or 2wd?
toss coin NOT ABS sensors.
there are 2 speed sensors ill do all 3 permutations of car
4wd one or tail of transfer case
2wd one on tail of 5speed box.
any, the backup speed sensor in the speedometer cluster
89-98 years and was deleted 1999, usa.

why ask ,tell why. so we can be on the same page and
not have to document all the above.

color is of on concern, only correct part numbers matter !!!

colour (non usa spelling) is my only real useful HINT.
never said speedometer fails. or odometer fails
the trans is manual so no speed sensor needed ever there to shift automatially,its a stick

scan it yet.?
THAT BE FIRST.

i looked at our 1999 usa GV . serv. man
best i can tell speedo has new electronic head.
no speedo cable. first year, in fact. (i owned a 97 and 04)

so when VSS goes dead (say)
the speedo goes dead
odom goes dead
and ECU sets DTC errors for VSS dead.
3 clear symptoms.
some cars have different VSS1 to match, axle gears.
the vss gear on end .

on newer cars with stick shift
like mine now
the aBS sends speed to PCM
so there is no transmission speeds sensors at all , 6sp, m/t
so lacking symptoms, me bollixed.

Feb 28, 2017 | 1999 Suzuki Grand Vitara

1 Answer

2000 Park avenue ultra speedo jumps sporradically and trans shifts down upon deceleration only. No ECM codes!


first : get rid of the mechanic you used . the problem is probably in the speedo head unit take out the old one and take to a reliable electronics tech . or buy a new one

Feb 26, 2014 | Buick Park Avenue Cars & Trucks

1 Answer

Codes p1747 and p0500


The 500 code is vehicle speed sensor,the other is spooky BUS system failure ECM?EGS controller. The 500 is probably your shift problem. Hopefully the other is a ghost.Seems you should be able to manually shift and get low gear

Feb 03, 2014 | Cars & Trucks

1 Answer

Buick rendezvous speedometer


If the "check Engine" light is illuminated the check for codes in ECM. Probably a speed sensor.

Sep 04, 2013 | Cars & Trucks

1 Answer

My speedometer will not work check engine light goes on and off and the overdrive indicator light flashes. All this happens intermittently with hotter weather it seemingly happens more frequently. Scanned...


code p 0500 is for the vehicle speed sensor (VSS) which works the speedo as well as the ratio changes
code p0720 refers to the output shaft sensor --ECM or transmission control module (TCM)
the vss reports to the tcm which reads the road speed and gear ratio and shifts the appropriate solenoid

May 12, 2017 | Cars & Trucks

2 Answers

I have a 94 4runner and I ran the diagnostic and its a 42 code for the OD/off and engine 42. It doesn't shift into over drive sometimes and it'll blink OD/off every now and then, and the speedometer...


Hi,

Code #42 on the 4Runner denotes a problem with the Vehicle Speed Sensor (VSS) circuit.

It means the ECM did not detect a signal from the VSS, above 2,200rpm....which might explain the speedo issue - Does your speedo play up, only when engine running above 2,200rpm or 2,700rpm?

Areas to check (in this order) are:

- Open (or short) in the VSS circuit
- faulty VSS sensor
- ECM fault within VSS circuit


Cheers,

"If this has helped you, please rate this solution" :-)

Jan 27, 2010 | 1994 Toyota 4Runner

1 Answer

Speedometer goes to 0 and trans downshifts


There are 2 speed sensors on the transaxle. One is for vehicle speed and one is for trans output shaft speed. My guess is that you replaced the one for output shaft speed.

Nissan Scope Technician- 10 years with Nissan

Oct 26, 2008 | 1999 Nissan Sentra

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