LIGHT ON PRNDL OUT ON DASH

check all fuses. first!!!
then scan the PCM, <<<< stated here and world wide 1million + times.
OK the dash cluster has s cute PRNDL Display
and this display is acting pure wrong that means PRNDL is failing
there are 3 technologies here (yours is last one.)

• old cars have PRNLD switch bad.
• or PRNDL on box works, but the TCM sets the gear you selected
• but the box reads back wrong (solenoid read back or pressure switches wrong)

or the IP cluster comms are failing.

i will now read the manual to you, SM service manual
and no engine told by you, (hard nut that)

4R70W , has in fact the pressure feed back sensors in the box
with EPC, it PCM tunes the pressure called line main.
so the PCM reads back what you selected
then if the pressure sensors read wrong, the display shows wrong
it means the PCM In not happy with this transmission
and only scanned it to find out why it is not happy is the only clues and cures.
and this
digital trans range
DTR sensor completes start crank circuit with transmission in Park and
Neutral, reversing lamp circuit in Reverse, and neutral sense cir-
cuit (4x4 only) in Neutral. DTR sensor also opens/closes a set of
four switches monitored by PCM to determine position of manual
lever (P, R, N, D, 2, 1)

when DTR reads wrong so will the cluster cute PRNDL indiector.
my guess to you are ignoring the CEL, check engine lamp.
driving.? (check power train lamp it really means)

The standard instrument cluster contains a microprocessor. The instrument panel cluster (IPC) microprocessor communicates with other controllers in the vehicle over the Class 2 serial data bus. The information passed over the Class 2 bus, along with direct external connections to other controllers and devices provides the inputs that are used to operate all of the gauges and the illuminated displays in the cluster. Some displays and gauges are operated directly by external sources (devices or controllers) and others are under software control of the IPC. As the IPC microprocessor runs the operating software, the microprocessor continuously processes Class 2 data in order to determine the correct values and states to display.


PRNDL Indicator (Park Reverse Neutral Drive Low)
The PRNDL display is a variable function electronic display located in the IPC. The PRNDL display is capable of displaying PRND321. The display electronically illuminates, or lights the back of the desired character in order to indicate the gear selection in the transmission. The IPC controls the PRNDL by use of the Class 2 messages that are received from the PCM/VCM. The vehicles with automatic transmissions have an electronic park reverse neutral drive low (PRNDL) range indicator. The system uses the signals from the neutral safety back up (NSBU) switch on the side of the transmission. Signals from this switch determine which LED is in the electronic PRNDL will light. The system is electronic. No internal adjustment is needed. Refer to Transmission/Transaxle for diagnostic information.

Odometer/Gear Shifter (PRNDL) Display FIX - GMC/Chevy ...

? 4:15
https://www.youtube.com/watch?v=-PQ-x11Vjng
Jan 24, 2012 - Uploaded by EricTehRedneck
Odometer/Gear Shifter (PRNDL) Display FIX - GMC/Chevy ...grease, it does in fact help insulate electrical connections but imnot sure lithium would help. .... i have a 2000 Chevy Astro van the park indicator goes out when you start ... volts but now the battery light stays on and the transmission will not shift ...

GM Electronic Gear Indicator and Tripometer Odometer ...

? 5:47
https://www.youtube.com/watch?v=jTQIVS_uB4g
Aug 11, 2010 - Uploaded by zcomputerwiz
Didn't light up anymore. ... Symptoms: PRND321 and Tripometer/Odometer no longer light. ... 2002 which the odometer and shift indicator do not work no more. ... But before taking the dash out I would like to know how to remove those .... Instrument cluster gear select blank screen solder fix Chevrolet GM ...

Repair the odometer/PRND321 LCD display on a '99-'06 ...

www.instructables.com/.../Repair-the-odometergear-select-L...

InstructablesIn this Instructable, I will show you how to repair odometer/gear select ... Repair the

Did they change the BCM or PCM? The BCM doesn't have anything to do with the gauges or transmission shifting or the PRNDL lights. The transmission range sensor is where I would start. This sends a signal to the PCM, from the PCM to the PRNDL lights. The PCM also reads other sensor for shifting. I would have to put it on a scanner to see what was going on. Three things I would definitely check are the range sensor, wires from the range sensor to the PCM and the PCM.

It shares a fuse with something else. So if it doesn't work, the bulb may be out. Unless you notice dash lights that don't light up, then you should check those fuses.

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power and eco modes?
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about lights out issue:
dash lights and all other interrior lights connected to fuses inside fuse box. fuse is blown.

please check fuses #7 #16 and #17 (cluster, courtesy lamp,radio illumination)

The only transmiision light that will show up on your dash would be where you see the different gears you are such as PRNDL. If you are ahving transmission problems or at least your computer believe it is where the gears show an "E" will show up there instead of what gear you are in. Below I took some snapshots of all the dash warning lights with desciptions of there meaning for you. I hope this helps and good luck.

to start off change the prndl swich.

pull dash cluster sometimes. it is a element I would live with it costly

it could be something as simple as a bulb being burnt on the dash panel