P0841 on a 2016 Nissan Altima means the transmission fluid pressure sensor “A” is reporting voltages outside the expected range, so the PCM/TCM can’t trust hydraulic pressure data and may limit gears or shift poorly. You should scan for related codes, check fluid level and condition, inspect the TFPS wiring and connector for damage or corrosion, and compare live sensor voltage to specs; replace the sensor or repair wiring if out of range, and continue below to learn how to proceed.
Quick Tips
- P0841 on a 2016 Altima means the transmission fluid pressure sensor circuit is reading outside the expected range.
- Common causes include a failing TFPS, low/contaminated fluid, clogged filter, or damaged wiring/connectors.
- Symptoms: transmission limp mode, rough or delayed shifts, slipping, warning lights, and transmission-related messages.
- Start diagnostics by confirming the code, monitoring live TFPS voltage/pressure, and inspecting wiring and connectors.
- Fixes range from sensor replacement ($100–$250) and wiring repair to fluid service or valve body/TCM work if hydraulic or control faults are found.
What P0841 Means for a 2016 Nissan Altima
When a P0841 code pops up on your 2016 Nissan Altima, it’s telling you that the vehicle’s control module detected a transmission fluid pressure sensor signal that’s outside the normal range.
You should know the TFPS “A” converts hydraulic pressure to voltage, feeding the PCM/TCM.
An out-of-range reading means electrical fault, wrong fluid level, internal hydraulic issue, or a failing sensor.
For diagnosing fuel- and pressure-related issues on many vehicles, checking the fuel pressure test port and using a proper pressure tester can help isolate sensor versus system faults.
Symptoms to Watch For
Now that you know P0841 points to an out-of-range transmission fluid pressure sensor signal, you should watch for several observable symptoms that indicate the problem is affecting drivability.
You’ll see check engine or transmission warning lights, possible limp mode restricting gears, rough or delayed shifting, slipping or starting in higher gears, reduced fuel economy, jerking during acceleration, and occasional transmission-related dashboard messages. Many cases are caused by low transmission fluid or contaminated fluid, so check fluid level and condition early in diagnosis. A failing alternator can indirectly cause electrical issues that worsen transmission sensor readings, so inspect the charging system when diagnosing related electrical faults.
Common Causes and Where the Sensor Is Located
Although multiple issues can trigger a P0841 on a 2016 Nissan Altima, most cases trace back to the transmission fluid pressure sensor (TFPS) itself, the fluid and filter condition, wiring and connectors, or the transmission control electronics; you’ll want to check each area systematically.
The TFPS mounts on the transmission housing, often near the valve body; inspect fluid condition, wiring loom, and connector corrosion.
Regular inspection is important because transmission fluid leaks and degraded seals can lead to low fluid and damage that may trigger the P0841 code.
Step‑by‑Step Diagnostic Checklist
Before you start swapping parts, follow a clear, step-by-step diagnostic checklist so you can pinpoint whether P0841 is caused by a sensor, wiring, fluid, or control module issue.
Confirm P0841 and related codes with a scanner, monitor live pressure and sensor voltages, inspect wiring/connectors, bench-test sensor resistance and line pressure, then verify TCM operation and apply software updates before replacing components. Also check battery, fuses, and engine grounds early in the process to rule out communication or power-related causes.
Repair Options and Estimated Costs
With the diagnostic checklist complete and you knowing whether P0841 stems from sensor signal, wiring, fluid, or control‑module issues, you can evaluate repair options based on invasiveness, likelihood of success, and cost.
Sensor swaps run $100–$250 plus labor; wiring fixes $50–$150; fluid service $100–$200; valve body work $200–$500; TCM updates $0–$150; CVT replacement is costly.
Wrapping Up
You’ve learned that P0841 means low transmission fluid pressure feedback in your 2016 Altima, usually tied to a faulty pressure sensor, wiring, or valve body. Check fluid level and condition first, then test the transmission pressure sensor and related wiring with a multimeter and scan tool; inspect the valve body if pressure readings remain abnormal. Repairs range from sensor replacement to valve body overhaul; choose parts and labor based on diagnosed cause to restore proper transmission function.